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 Correct Answer is D
The opening of potassium channels allows 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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Related Questions
Correct Answer is C
Explanation
The data in the table does not support any of the conclusions a, b or d. The only conclusion that can be drawn from the data is c. The time of fall is independent of the mass of the object. This is because objects 1 and 2 have the same mass but different times of fall, while objects 3 and 4 have different masses but also different times of fall.
A. Objects A and B are not mentioned in the table, so this conclusion cannot be drawn from the data.
B. The data does not support the conclusion that the greater the mass of an object, the faster it will fall. In fact, object 3 has a greater mass than object 2 but falls in less time.
C. Air resistance is not mentioned in the table, so this conclusion cannot be drawn from the data.
Correct Answer is C
Explanation
The organ that filters excess solutes from the blood is the kidney. The kidneys are a pair of bean-shaped organs located on either side of the spine, just below the rib cage.They are responsible for filtering waste products and excess fluid from the blood and excreting them in the form of urine.
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.
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