Which area of the graph shows when voltage-regulated sodium channels open? 1 2 3

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Which area of the graph shows when voltage-regulated sodium channels open? 1 2 3 4 Which one of the following is not a major function of the spinal cord? mediates quick and involuntary response to a stimulus helps maintain posture and equilibrium during locomotion integrates sensory input from special senses like hearing receives sensory input and sends motor signals through spinal nerves Which part of the brain helps you to see this exam question? Temporal lobe Parietal Lobe Occipital Lobe Frontal Lobe What is the target organ of adrenocorticotropic hormone or corticotrophin (ACTH)? The anterior pituitary the posterior pituitary the adrenal cortex the adrenal medulla The secretion of would rise after a meal rich in sugar Testosterone Calcitonin Insulin Glucagon Which of the following would hypothetically decrease the effect of "BIO23-final-exam-anxiety" hormone? Increase the amount of hormone secreted. Block receptors for test anxiety hormone. Increase the sensitivity of the receptors for test anxiety hormone Increase the amount of test anxiety hormone releasing hormone

Explanation / Answer

20.

b) in transmembrane potential graph, 2 indicates point at which depolarization takes place ie. opening of voltage-gated sodium channels.

This happens because at this stage inside of the cell (neuron) is more negative relative to the outside because there are more sodium ions on the outside. This makes sodium channels open and sodium ions to rush inside. Sodium has positive charge, so opening and influx of the sodium ions makes the cell more positive and depolarized.

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