Feces pass from the sigmoid colon directly into the
A. descending colon.
B. rectum.
C. cecum.
D. ilium.
Answer: B
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Which of the following is not a characteristic of capillaries?
a. thin walls b. short distance between adjacent vessels c. distensible walls d. slow blood velocity e. large total surface area
Blood returning from the vena cava:
a. enters the right atrium. b. enters the left atrium. c. is poorly oxygenated. d. both (a) and (c) above. e. both (b) and (c) above.
Predict where autonomic neurons act to regulate heart rate?
a. ventricular contractile cells b. atrial contractile cells c. autorhythmic SA node cells d. Purkinje fibers