Blood moves forward through veins because of all of the following except
A) the pressure in the veins is lower than in the arteries.
B) pumping by the smooth muscle in the wall of the vein.
C) valves permitting flow of blood in one direction only.
D) valves in the veins preventing the backward flow of blood.
E) skeletal muscle compression.
Answer: B
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Oversecretion of aldosterone causes
A. decreased reabsorption of Na+ by the kidney. B. increased reabsorption of phosphate ions by the kidney. C. increased secretion of K+ by the kidney. D. decreased secretion of Ca2+ by the kidney. E. decreased secretion of K+ by the kidney.
Which chamber pumps the blood to the body through the systemic circuit?
A. Right ventricle B. Right atrium C. Left ventricle D. Left atrium
What is E pointing to?
a) Soft palate b) Ethmoid bone c) Hard palate d) Nasal septum e) Air cells
What term is used to describe the steady-state value for any variable that the body attempts to maintain?
A. Set point B. Equilibrium potential C. Error signal D. Reflex arc E. Median value