With advancing age, the lymphatic system
A. produces an increasing number and variety of B-lymphocytes.
B. becomes less efficient at absorbing dietary lipids.
C. is less responsive to antigens.
D. ceases to transport lymph.
E. All of the choices are correct.
Answer: C
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Which vein receives blood from the pancreatic veins, short gastric veins, and the right gastroepiploic vein?
A. Inferior mesenteric vein B. Posterior mesenteric vein C. Hepatic portal vein D. Hepatic veins E. Splenic vein
When the temperature of the preoptic area of the hypothalamus exceeds its thermostat setting,
A) peripheral vasoconstriction occurs. B) skin blood flow increases. C) rate and depth of respiration decreases. D) sweat glands are inhibited. E) blood is shunted to deep veins.
The graph below was generated by students in a physiology lab. The top trace (myogram) shows contraction force, the bottom (EMG) shows the electrical stimulus. On the graph, label a muscle twitch. What property of muscle is being tested here? What caused the increase in force (and subsequent decrease)?
The apical surfaces of intestinal cells have microvilli that are sometimes referred to as the ________.
What will be an ideal response?