During the absolute refractory period which of the following is true?
A) The signal grows weaker with distance.
B) It is possible to trigger a new action potential, but only with an unusually strong stimulus.
C) The neuron fires at its maximum voltage if a stimulus depolarizes the neuron to threshold.
D) If a neuron reaches threshold, the action potential goes to completion.
E) No stimulus of any strength will trigger a new action potential.
E
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Cell A is a gland cell that makes and secretes proteins. Cell B is another type of cell that synthesizes and secretes steroids. If you were to look at electron micrographs of the two cells, what differences would you expect to see?
A. The two cells would most likely look identical. B. Cell A would have fewer secretion granules than cell B. C. Cell B would have more granular endoplasmic reticulum than cell A. D. Cell A would have more granular endoplasmic reticulum than cell B. E. Cell A would have more agranular endoplasmic reticulum than cell B.
The female gonad is called a(n)
A) vestibule. B) fallopian tube. C) vagina. D) clitoris. E) ovary
Adhesion of blood-borne leukocytes to the endothelial lining is known as ____________________
Fill in the blank(s) with correct word
Which of the following statements concerning the permeability of a typical neuron membrane at rest is TRUE?
A. The permeability to Na+ is much greater than the permeability to K+. B. All of the K+ channels in the membrane are open. C. The voltage-gated Na+ channels are in the inactivated state. D. Most of the voltage-gated Na+ channels are in the closed state. E. There is equal permeability to Na+ and K+.