The velocity of blood flow in capillaries
a. is greater than that for arterioles.
b. is greater than that for veins.
c. is slow enough to favor adequate exchange.
d. both (a) and (b) above.
e. both (a) and (c) above.
C
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More than one sperm is prevented from fertilizing an egg by all of the following mechanisms except:
A. Opening sodium channels in the plasma membrane causes a change in the electrical charge of the membrane. B. Secretion of material from cortical granules pushes sperm away from the already fertilized egg. C. A slow block to polyspermy occurs. D. A fast block to polyspermy occurs. E. Meiosis II is completed by the egg.
Hematocrit is the percentage of ____ in a blood sample.
Fill in the blank(s) with the appropriate word(s).
Which situation describes a feedforward mechanism?
A. Blood glucose returns toward normal an hour after a meal. B. The smell of rotten food on a plate triggers the vomit reflex. C. A drop in core body temperature triggers shivering. D. An increase in core body temperature stimulates sweating. E. Food in the stomach triggers the production of stomach acid.
Where do most local potentials form in a neuron?
A) The somas B) The Schwann cells C) The dendrites D) The trigger zone E) The axon hillock