Precapillary sphincters
A. control the blood flow into capillary beds.
B. carry blood under high pressure.
C. serve as valves in veins.
D. are voluntary structures.
E. are found in the tunica media.
Answer: A
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If blood pressure doubled, the blood flow through a vessel would be
A) doubled. B) halved. C) four times greater. D) 1/4 as much. E) unchanged.
A bone thickens
A) as compact bone is deposited beneath the periosteum of the diaphysis. B) as a result of cell division in the medullary cavity. C) due to increased production of bone matrix by osteoclasts. D) as a result of increased activity within the epiphyseal plate.
In a person with respiratory acidosis, HCO3- is actively secreted into the urine by the tubular cells
Indicate whether the statement is true or false.
Hair cells, mechanoreceptors, rods and cones, chemoreceptors, and free nerve endings are all examples of what?
A. Sensory receptor B. Crista ampullaris C. Nociceptor D. G protein