Voluntary movements are carried out by the contraction of
A) nonstriated muscle.
B) all types of muscle.
C) smooth muscle.
D) skeletal muscle.
E) cardiac muscle.
D
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Calcium reabsorption at the kidneys is promoted by the hormone
A) calcitriol. B) aldosterone. C) cortisol. D) ADH. E) calcitonin.
All of the following local chemical factors will cause vasodilation of arterioles, except
a. decreased K+. b. increased CO2. c. increased acid. d. decreased O2. e. histamine release.
Urea diffuses from the collecting duct into the medullary interstitial fluid maintaining to the medullary interstitial fluid osmotic gradient.
a. true b. false
Which of the following valves is most often faulty in the heart?
a. the aortic semilunar valve b. the tricuspid valve c. the pulmonary semilunar valve d. the mitral or bicuspid valve