Each kidney has more functional capacity than is ordinarily needed.?
Indicate whether the statement is true or false
True
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For maximum efficiency in loading oxygen at the lungs,
A) the pH should be slightly acidic. B) the temperature should be slightly lower than normal body temperature. C) DPG levels in the red blood cells should be high. D) the PO2 should be about 70 mm. E) All of the answers are correct.
For defecation to take place, the puborectalis must
A. relax. B. contract.
Which of these events occurs when a person steps on a tack with the right foot?
A) The right foot is pulled away from the tack because of the Golgi tendon reflex. B) The left leg is extended to support the body because of the stretch reflex. C) The flexor muscles of the right thigh contract, and the extensor muscles of the right thigh relax because of reciprocal innervation. D) Extensor muscles contract in both thighs because of the crossed extensor reflex.
Which receptor(s) always send(s) a signal, but the rate of action potentials changes as a result of stimulation?
A) phasic B) tonic C) both phasic and tonic