The absolute refractory period assures
A. prolonged depolarization during the action potential.
B. completion of repolarization before another action potential.
C. that no after-potential occurs.
D. reversal of the direction of propagation of the action potential.
E. that the stimulus is strong enough to elicit a response.
B
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Imagine a neuron that has several hundred axonal knobs impinging on it. The majority of these axonal knobs are shown to be "firing." However, the neuron in question does not transmit an impulse. Give a valid explanation of why this could occur.
What will be an ideal response?
The number of primary oocytes in a female is
a. decreased continually throughout her reproductive life from puberty to menopause b. maintained constant during her reproductive life because those that are lost are continuously replaced by an equal number of new primary oocytes c. increased at the time of menopause d. both a and c e. both b and c
A term that means nerve tracts cross to the opposite side of the body is ___________.
A) olivary B) pons C) decussate D) tectum E) colliculi
Blood vessels in the ________ provide a hair with its sole source of nutrition.
A. bulb B. dermal papilla C. shaft D. root E. medulla