During an action potential, the rapid decrease in sodium permeability and simultaneous increase in potassium permeability is responsible for Repolarization.
K+ departs the cell after Na+, which enters the cell first. Ions can move freely across the axon membrane because of the difference during the action potential.Because sodium contains a positive charge, the neuron becomes more positive and depolarized. Potassium channels take longer to open. As soon as the cell does open, K+ rushes out, reversing the depolarization known as repolarization.Sodium channels close during the peak of the action potential when potassium leaves the cell. When potassium ions are effluxed, the membrane potential is lowered or the cell becomes hyperpolarized.Outside of the cell, the concentration of Na+ is greater than inside the cell. while the concentration of K+ is is greater inside the cell than outside.
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Hich one of the substances is not transported by the human circulatory system?(1 point) a) water b) digested food c) carbon dioxide d) undigested food 5
Answer:
D
Explanation:
Undigested food is not transported by the human circulatory system. Hence, option D is correct.
What is the circulatory system?The system which contains the heart, blood vessels, and blood is called the circulatory system. There are three types of circulation that take place in the body and that is systemic, coronary, and pulmonary circulation.
The heart is a muscular organ, that pumps blood in the body. Blood vessels carry blood from the heart to tissues or tissues to the heart. Blood is a fluid, which flows inside the blood vessels.
The main function of this system is to transport water, nutrients, digested food, oxygen, carbon-di-oxide, minerals, and excretory products in the entire body through blood. It does not transport undigested food. Hence, option D is correct.
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How many chromatids does a human somatic cell contain after interphase and just prior to mitosis?.
Answer:
Explanation:
92
HELP REAL QUICK PLEASE!
What causes the
sun's rays to hit
different parts of
earth at different
angles?
A. the curve of the earth
B. the magnetic field of the
earth
C. the distance between
the sun and the earth
D. more wind from the
equator
Answer:
A...because the earth is round therefore the sun cannot hit the same places
While doing the Osmosis, Effect of Solute Concentration experiment, forgetful Frank left his bag with 10% sucrose in the beaker of water for 2 hours instead of one, how would his results be different from the rest of the class?
The effect is that Frank's 10% sucrose bag will be heavier than that of others.
OsmosisWater molecules move from the region of lower solute concentration to the region of higher solute concentration.
Thus, water will continue to enter into a 10% sucrose bad dropped in a beaker of water until an equilibrium is established between the 2 media.
This means that the longer the bag stays in the beater containing water, the more the water will enter, and the heavier it will weigh.
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What is the function of the primers in pcr?
The function of primers in polymerase chain reaction is that it serves as the starting point for DNA synthesis.
Function of primers in Polymerase chain reaction
Primers function in PCR by;
Primers serve as the starting point for DNA synthesisThe polymerase enzyme can only add DNA bases to a double strand of DNA. Only once the primer has bound can the polymerase enzyme attaches.Thus, the function of primers in polymerase chain reaction is that it serves as the starting point for DNA synthesis.
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What blood vessel is found in the anterior-medial thigh?
The blood vessel that is found in the anterior-medial thigh is the femoral artery.
What is the femoral artery?The femoral artery is a major blood vessel that transports blood from the abdomen to the lower limbs.
The femoral artery is fundamental because it transports high volumes of oxygen-rich blood.
In conclusion, the blood vessel that is found in the anterior-medial thigh is the femoral artery.
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A chamber within a bone normally filled with air is a:
A chamber within a bone normally filled with air is a sinus
What is a sinus?A sinus is a sac or cavity in an organ or tissue, or an abnormal cavity formed as a result of the destruction of tissues.
Sinus also refers to paranasal sinuses, which are air cavities in the cranial bones, near the nose and connecting to it.
Some individuals have four paired cavities found in the cranial bone or skull.
Thus, sinus is a chamber within a bone normally filled with air.
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Put the following events of the neuromuscular junction in the order in which they occur. 1. Action potential is propagated in the sarcolemma. 2. Acetylcholine binds to ligand gated sodium channels. 3. Action potential arrives at the neuromuscular junction. 4. Vesicles full of acetylcholine are stored at the axon terminal. 5. Acetylcholine is released into the synaptic cleft.
Muscle contraction occurs when somatic neurons and muscle fibers connect through neuromuscular synapse. The order of events is 4, 3, 5, 2, 1.
How does muscle contaction occur?Muscle fiber contractions are due to stimulation produced by somatic motor neurons, when their axons get in contact with muscle fibers through a neuromuscular synapse.
The sequence of events during muscle contraction is as follows,
1) At rest, attraction strengths between myosin and actin filaments are inhibited by the tropomyosin.
2) An action potential originates in the central nervous system, and travels to the somatic motor neuron membrane, where it activates the calcium channels.
3) Calcium channels open and the ions get into the neuron.
4) Calcium makes vesicles fuse with the membrane.
5) Vesicles release the neurotransmitter acetylcholine (Ach) into the synaptic space at the juncture.
6) Ach moves through the synaptic cleft and binds to its receptors on the skeletal muscle fiber.
7) This recognition event causes the ion channels to open,
sodium ions cross the membrane to get into the muscle fiber (sarcoplasm), potassium gets out.8) The difference in charges caused by the migration of sodium and potassium makes the muscle fiber membrane turns more positively charged (depolarized).
9) The action potential caused by the depolarization enters the t-tubules. Consequently, it depolarizes the inner portion of the muscle fiber.
10) Depolarization activates the T tubules membrane calcium channels and releases the ion into the sarcolemma.
At this point, tropomyosin is obstructing binding sites for myosin on the thin filament.
11) When calcium binds the troponin C, the troponin T alters the structure of tropomyosin by moving it and unblocks the binding sites.
12) Myosin binds to the uncovered actin-binding sites, and while doing it, ATP is transformed into ADP and inorganic phosphate.
13) Z-bands are then pulled toward each other, thus shortening the sarcomere and the I-band and producing muscle fiber contraction.
According to this framework, the correct order of events is,
4. Vesicles full of acetylcholine are stored at the axon terminal.
3. Action potential arrives at the neuromuscular junction.
5. Acetylcholine is released into the synaptic cleft.
2. Acetylcholine binds to ligand gated sodium channels.
1. Action potential is propagated in the sarcolemma.
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Regarding the factors of true labor: distortion of the myometrium increases the sensitivity of the skeletal muscle layers. the fetal pituitary releases oxytocin in response to estrogens. placental estrogens decrease the sensitivity of the muscle cells of the myometrium. maternal oxytocin release is inhibited by high estrogen levels.
Regarding the factors of true labor, the the fetal pituitary releases oxytocin in response to estrogens.
What is oxytocin?It should be noted that oxytocin means a hormone that is involved in childbirth. It is associated with trust and empathy.
In this case, regarding the the factors of true labor, the the fetal pituitary releases oxytocin in response to estrogens.
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The receptor cells for vision are located in the _____ and are called _____ and _____
The receptor cells for vision are located in the retina of the eyes and are called rods and cones.
What are receptor cells?
Receptor cells are proteins found either inside a cell or on its surface which receive a signal.
The two primary photoreceptor cells are rods and cones and they contribute to the information used by the visual system to form a representation of the sight.
They are found in the retina of the eye.
Therefore, the receptor cells for vision are located in the retina of the eyes and are called rods and cones.
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Which protein in the electron transport system listed in the box to the rightfunctions as diffusible soluble protein
The protein in the electron transport system listed in the box to the right functions as diffusible soluble protein is Cytochrome C.
What is the role of cytochrome c?Cytochrome c is a small heme protein that is associated with the inner membrane of mitochondria. It is a soluble protein, unlike other cytochromes, and is an essential component of the electron transport chain. It is capable of performing oxidations and reductions, but does not bind oxygen.
In this case, diffusible soluble protein is Cytochrome C is an essential component of the electron transport chain.
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Some common, underlying predisposition, probably at least partly genetically based, leads to _______ in men and to somatization disorder in women.
Some common, underlying predisposition, probably at least partly genetically based, leads to anxiety disorders in men and to somatization disorder in women.
What is anxiety and symptoms?Anxiety symptoms can manifest on a physical level, such as a feeling of tightness in the chest and tremors, or on an emotional level, such as the presence of negative thoughts, worry, insecurity or fear, for example, and usually several symptoms appear at the same time.
In this case, women are twice as likely to develop anxiety as men because the cultural issue, of activities that are left to the care of the woman: care for the house, with the children, with the family, regardless of whether she works or not
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Which act prompted the developers to install stormwater management systems to handle the movement of polluted water? The_______prompted the developers to install stormwater management systems to handle the movement of polluted water.
US clean water act as a prompted the developers to install stormwater management systems to handle the movement of polluted water.
What is the role of us clean water act?The Clean Water Act (CWA) establishes the fundamental framework for controlling pollution discharges into American waters and setting quality criteria for surface waters.
In 1972, the US Clean Water Act was adopted. The Act's principal goal was to control and minimize the entry of pollutants into water bodies. This was done to make the water bodies cleaner, clearer, and more suitable for usage by the general public and the abundant life forms that were already present.
In order to handle the removal of contaminated water from the water bodies, the developers decided to install stormwater management systems.
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Two insects groups vary genetically by two genes. When put together, they were able to reproduce a produce offspring that could also breed. Which best describes this insect population?
Answer:
The insects belong to the same species
Answer:
The insects are the same species perhaps.
Explanation:
Relative time of divergence from a common ancestor can be estimated by:.
The relative time of divergence from a common ancestor can be estimated by comparing the nucleotide/protein sequence.
What is sequence homo-logy?In molecular biology, sequence homo-logy means the degree of similarity between sequences due to a common ancestor.
A sequence is a given fragment of a single DNA strand where nucleotides are arranged in a specific linear order.
Divergence or separation between lineages is directly proportional to the level of sequence homo-logy.
In conclusion, the relative time of divergence from a common ancestor can be estimated by comparing the nucleotide/protein sequence.
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What info so cladistics give?
Cladistic analysis provides information about the evolutive relationship between taxa according to derived characters. This information is represented in a cladogram.
What information does cladistics provide?
The cladistic analysis provides information about the relationship between different taxa according to shared characters.
This information is represented in a cladogram that uses derived characters to express the evolutive relationships between groups.
Derived characters emerge and are inherited by all the descendant groups, meaning that all of them carry these traits until they disappear.
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What would happen if you changed the temperature and ph around the enzyme?
However, extremely high temperatures can cause an enzyme to lose its shape (denature) and stop working. pH: Each enzyme has an optimum pH range. Changing the pH outside of this range will slow enzyme activity. Extreme pH values can cause enzymes to denature.
If the temperature and pH around an enzyme is changed, the enzyme would likely denature. Details about enzymes can be found below.
What is an enzyme?Enzymes are biological catalyst that regulates the rate of biochemical reactions in living cells.
Enzymes function at a particular temperature and pH and can easily get denatured i.e. alter its original form.
This suggests that if the temperature and pH around an enzyme is changed, the enzyme would likely denature.
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13. What two sub-processes do NADH and FADH2 cycle between? What do they do at each location?
NADH and FADH2 cycle is responsible for the production of small amount of energy in the form of ATP.
What occur in the NADH and FADH2 cycle?FADH2 and NADH are created through reduction-oxidation reactions in the Krebs cycle. This cycle produces small amounts of energy in the form of adenosine triphosphate (ATP), and also responsible for the production of compounds i.e. FADH2 and NADH. NADH produces 3 ATP whereas FADH2 produces 2 ATP molecules
So we can conclude that NADH and FADH2 cycle is responsible for the production of small amount of energy in the form of ATP.
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Match the items. The task is to match the lettered items with the correct numbered items. Appearing below is a list of lettered items. Following that is a list of numbered items. Each numbered item is followed by a drop-down. Select the letter in the drop down that best matches the numbered item with the lettered alternatives. a. Host ribosomes cannot translate it. Need to copied to strand to make viral proteins b. Translated directly to make viral proteins c. Integrated viral genome in an animal host d. Enzyme needed to copy RNA to RNA e. Synthesizes complementary ssDNA once inside the cell.
The lettered items are matched with the correct numbered items as follows:
a. -SSRNA: host ribosomes cannot translate it. Thus, it need to be copied to + strand to make viral proteins.
b. +SSRNA: it can be translated directly to make viral proteins.
c. Provirus: the integrated viral genome in an animal host.
d. RNA dependent RNA polymerase: an enzyme needed to copy RNA to RNA.
e. Retrovirus: it synthesizes complementary ssDNA once inside the cell.
What is a genome?A genome can be defined as the complete set of hereditary instructions which is typically found in the deoxyribonucleic acid (DNA) such as:
+SSRNA-SSRNADSRNAIn conclusion, the lettered items should be matched with the correct numbered items as follows:
-SSRNA: the host ribosomes cannot translate it. Thus, it need to be copied to + strand to make viral proteins.+SSRNA: it can be translated directly to make viral proteins. Provirus: the integrated viral genome in an animal host. RNA dependent RNA polymerase: an enzyme needed to copy RNA to RNA. Retrovirus: it synthesizes complementary ssDNA once inside the cell.Read more on genome here: https://brainly.com/question/2193677
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Complete Question:
Match the items. The task is to match the lettered items with the correct numbered items. Appearing below is a list of lettered items. Following that is a list of numbered items. Each numbered item is followed by a drop-down. Select the letter in the drop down that best matches the numbered item with the lettered alternatives.
a. Host ribosomes cannot translate it. Need to copied to strand to make viral proteins
b. Translated directly to make viral proteins
c. Integrated viral genome in an animal host
d. Enzyme needed to copy RNA to RNA
e. Synthesizes complementary ssDNA once inside the cell.
1. +SSRNA
2. -SSRNA
3. Retrovirus
4. RNA dependent RNA polymerase
5. Provirus
Match the structure of proteins.
I
Primary structure
A
Twisted polypeptide chain
II
Secondary structure B
Folded polypeptide chain
III
Tertiary structure C
Linear polypeptide chain
I - C, II - A, and III – B
I - B, II - C, and III - A
I - A, II - C, and III - B
I - C, II - B, and III - A
The matching of the structure of proteins is as follows:
Primary structure: Linear polypeptide chain.Secondary structure: Twisted polypeptide chain.Tertiary structure: Folded polypeptide chain.Thus, the correct option is A.
What are Proteins?Proteins may be defined as intrinsically appearing, a remarkably complicated substance that consists of amino acid residues united by peptide bonds.
The primary structure of the protein is so simple and it looks like a linear chain of the polypeptide. The secondary structure of proteins consists of alpha-helix and beta-pleated sheet that involves the twisted form of polypeptide chains.
The tertiary structure of the protein is more complicated as compared to secondary and primary. This structure emerges due to the constant folding of polypeptide chains.
Therefore, it is well described above.
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Pietro has two dogs that are related, and he wants to understand why one of the dogs has tan fur and the other has brown fur.
What safety rule should you follow when performing an experiment that involves electricity?
when speaking of the anatomy of a virus, we can say that ________.
When speaking of the anatomy of a virus, we can say that it is a protein capsid which comes in form a RNA or DNA
What is anatomy of a virus?A virus is of a single or double-stranded nucleic acid surrounded by a capsid (called the protein shell).
When they are inside the living host cell, they can only produce once. Hence we can conclude that when speaking of the anatomy of a virus, we can say that it is a protein capsid which comes in form a RNA or DNA
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Which of the
following does NOT
protect vital organs?
Week
A. ribs
B. femur
C. skull
Answer:
femur I am pretty sure. The skull sheilds your brain, your ribs for your heart and lungs. backbone spine
Explanation:
Help! my nose bleed for more than 30 min and i feel abit dizzy what shoud i do, i am a little kid and my parents are sleeping because it is 6 am what should i do
at which state of respiration does the co2 release that place
A. Krebs cycle.
B. Glycolysis.
C. Electron Transport System.
Answer: A. Krebs cycle
Pulmonary edema and impaired ventilation occur during.
Pulmonary edema and impaired ventilation occur during cardiogenic shock.
What is cardiogenic shock?Cardiogenic shock is a type of shock that occurs when the heart is unable to pump enough blood that would be enough for the whole body.
The clinical manifestations of cardiogenic shock include:
Pulmonary edema and impaired ventilationPulmonary edema is the accumulation of fluid in the lungs while impaired ventilation which is unregulated intake and removal of oxygen and carbondioxide respectively from the body.
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Which represents the cross between parent plants if one is heterozygous and has yellow-colored pods and the other is homozygous and has green-colored pods?.
The cross between parent plants if one is heterozygous for yellow pods and the other is homzygous for green pods - Yy yy., i.e., option A.
What is heterozygous?The occurrence of different types of alleles is referred to as heterozygous condition.
A heterozygous genotype may consist of one normal allele and one mutated allele, or two distinct mutated alleles.
The missing options of the question are:
Yy ´ yyYY ´ yyYy ´ Yyyy ´ yyThe cross between parent plants if one is heterozygous for yellow pods and the other is homzygous for green pods - Yy yy.
Thus, the correct option is A.
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Answer: Yy’ yy
Explanation:
because I said so
The conduction system contains pacemaker cells, nodes, the __, and the __.
The conduction system contains pacemaker cells, nodes, the Purkinje fibers, and the bundle of His.
What is the conduction system of the heart?The conduction system of the heart refers to the the system of cells and fibers which enables conduction of nerve impulse which enables the contraction of the heart.
The conduction system of the heart consists of:
Sinoatrial nodeAtrioventricular nodeAtrioventricular bundle (bundle of His)Purkinje fibersTherefore, the conduction system of the heart coordinates the contraction of the heart.
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Some people have their gall bladder surgically removed to the formation of gall stones. Describe the function of the gall bladder and explain how a gall bladder removal would have on their digestion.
Underneath the right side of the liver, the gallbladder is a pear-shaped organ.
What is the function of gall bladder?Its primary function is to gather and concentrate bile, a digestive fluid made by the liver. The gallbladder is where bile is kept after the liver produces it. The gallbladder receives a signal from the stomach when you eat. Bile is released from the gallbladder when it contracts, and it travels through the gut via the major common duct. Bile combines with the food there and aids in digestion.
When the gallbladder is removed from a healthy person, there are rarely any obvious health or digestive issues, though there is a slight chance of diarrhea and fat malabsorption.
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