Which of the following does not occur in a photoreceptor during exposure to light?
a. Membrane hyperpolarization
b. Closure of Na+ channels in the outer segment
c. Increased neurotransmitter release from the synaptic terminal
d. Decrease in cyclic GMP in the outer segment
e. Closure of Ca2+ channels in the synaptic terminal
C
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Your friend puts on a mask and chases you as a prank. Your body responds by releasing epinephrine and norepinephrine, along with other physiological responses. Your friend frightening you is the ________, that cause the body's response.
Fill in the blank(s) with the appropriate word(s).
Gray matter derives its color from the myelinated axons that compose it.
Answer the following statement true (T) or false (F)
For maximum loading of hemoglobin with oxygen at the lungs, the
A) PCO2 should be high. B) pH should be slightly acidic. C) PO2 should be about 70 mm Hg. D) BPG levels in the red blood cells should be high. E) PO2 should be as high as possible.
Near the elbow, the brachial artery branches and gives rise to which of the following?
A. The radial and ulnar arteries B. The deep brachial and radial collateral arteries C. The radial and superior ulnar collateral arteries D. The radial and anterior interosseous arteries E. The ulnar artery and the superior ulnar collateral artery