Which of the following actions allows for repolarization of a neuron?
The inhibition of sodium and potassium pumps, stopping all ion movement into the neuron
The opening of sodium channels, allowing sodium to enter the neuron
The closing of both sodium and potassium channels to restrict movement of ions into and out of the neuron
The opening of potassium channels allowing potassium to leave the neuron
Correct Answer : D
D. The opening of potassium channels allowing potassium to leave the neuron
The correct answer is d. The opening of potassium channels allowing potassium to leave the neuron. Repolarization of a neuron occurs after an action potential, when the neuron's membrane potential returns to its resting state. This is achieved by the opening of potassium channels, which allows potassium ions to flow out of the neuron. This movement of positively charged ions out of the neuron helps to restore the negative membrane potential.
A. The inhibition of sodium and potassium pumps would not allow for repolarization because these pumps are necessary for maintaining the resting membrane potential.
B. The opening of sodium channels would cause depolarization, not repolarization.
C. The closing of both sodium and potassium channels would restrict ion movement, but it would not allow for repolarization.
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Explanation
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². This results in a loss of order as the solid melts and becomes a liquid.
The other options are not correct because they do not accurately describe a change that takes place as a solid turns to a liquid. Particles do not have a decrease in mobility, move closer together, or experience stronger intermolecular forces between them as a solid turns to a liquid.
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The other options are not correct because they do not accurately describe what occurs in an oxidation reaction. Removal of oxygen, addition of carbon, and addition of neutrons are not processes that occur in an oxidation reaction.
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The other options are incorrect because they do not result in a negative charge. Losing an electron would result in a positive charge. Losing or gaining a proton would change the identity of the atom and is not related to the formation of a chloride ion.
Correct Answer is A
Explanation
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The other options do not accurately represent the complementary sequence of bases or the antiparallel orientation of the strands.
BONUS:
Correct Answer is A
Explanation
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The other options, epithelial and nuclear, are not related to these processes.
Correct Answer is D
Explanation
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The other options are not correct because they do not accurately describe where both digestion and absorption happen in the digestive system. The gallbladder stores bile produced by the liver, but does not play a direct role in digestion or absorption. The esophagus transports food from the mouth to the stomach, but does not play a direct role in digestion or absorption. The stomach plays a role in digestion by churning food and mixing it with gastric juices, but most absorption occurs in the small intestine.
Correct Answer is A
Explanation
The correct answer is a. Heart and lungs. The thoracic cavity contains the heart and lungs, which are at greatest risk from severe blunt trauma to this area.
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Correct Answer is C
Explanation
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The other options are not correct because they do not accurately describe the organ that filters excess solutes from the blood. The stomach, spleen, and gallbladder do not filter excess solutes from the blood.
Correct Answer is D
Explanation
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Explanation
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The other options are not correct because they do not accurately describe the triple point of a substance. Sol, gel, and plasma are not phases that coexist at the triple.
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