What is the function of calcium in the production of an action potential?
A. Release of acetylcholine
B. Opening of chemically gated sodium channels
C. Inactivation of potassium channels
D. Return of neuron to resting state
A. Release of acetylcholine
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The length of the resting sarcomere is
A. longer than the length of a contracted sarcomere. B. shorter than the length of a contracted sarcomere. C. the same length as a contracted sarcomere. D. the same length as the muscle fiber. E. the same length as the myofibril.
There are ________ pulmonary veins
A) 2 B) 4 C) 6 D) 8 E) 12
Homeostatic mechanisms in response to blood loss include all of the following except
A) uptake of interstitial fluid due to reduced capillary pressure. B) inhibition of EPO secretion. C) activation of ADH secretion. D) activation of aldosterone secretion. E) increased thirst and water intake.
Which of the following does not influence the time necessary for a nerve impulse to be transmitted?
A) length of the axon B) presence or absence of a myelin sheath C) diameter of the axon D) presence or absence of nodes E) whether or not the impulse begins in the CNS