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 D
Explanation
Both digestion and absorption happen in the small intestine. Digestion is the process by which food is broken down into small molecules that the body can absorb and use for energy, growth, and repair. The final products of digestion are absorbed from the digestive tract, primarily in the small intestine.
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 C
Explanation
Ovulation is the process in which an ovarian follicle matures and releases a reproductive egg. During ovulation, the egg is released from the ovary and travels down the fallopian tube where it may be fertilized by sperm. The other options are not processes in which an ovarian follicle matures and releases a reproductive egg. Oogenesis is the process of egg cell formation, menstruation is the shedding of the uterine lining, and fertilization is the fusion of an egg and sperm to form a zygote.
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