Blood flow distribution can be adjusted by changing the diameter of the ____
a. arteries
b. capillaries
c. arterioles
d. veins
e. venules
ANSWER: c
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From which chamber of the heart does the right ventricle receive blood?
(a) right atrium. (b) left atrium. (c) left ventricle. (d) none of the above.
Which of the photographs in the above figure
represents the seedless vascular plants? a. moss b. fern c. conifer d. monocot e. all of these
Based on the criterion of segmentation, which
organism most closely resembles the earliest ancestral arthropod? a. dragonfly b. millipede c. tick d. crab e. scorpion
The hormones that are most directly involved with the process of birth are
a. estrogen and oxytocin. b. oxytocin and prostaglandins. c. oxytocin and progesterone. d. prolactin and estrogen. e. prostaglandin and progesterone.