The veins
a. act as high-resistance passageways for blood flow from the tissues to the heart
b. can serve as a blood reservoir by adjusting their total capacity to accommodate variations in blood volume
c. contain one-way valves that prevent backflow as blood moves toward the heart
d. have characteristics a and b
e. have characteristics b and c
E
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The ________ division of the ANS is most commonly associated with the preparation of the body for emergencies.
Fill in the blank(s) with the appropriate word(s).
Stem cells taken from a person to be used to treat a disease in that same person come
from A) existing cell populations or reprogrammed cells. B) the person or a blood relative. C) two different cell types. D) embryos or fetuses.
Regulation of peripheral resistance occurs most often in the
A. large arteries. B. medium-sized arteries. C. arterioles. D. capillaries. E. veins
The ________ of the sperm contains enzymes necessary for the penetration of the egg
A) acrosome B) nucleus C) tail D) midpiece