During organogenesis, somites do not give rise to which of the following?
A. Dermis of the skin
B. Vertebrae
C. Muscles of the trunk
D. The spinal cord
E. All of the choices are derivatives of somites.
Answer: D
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The residual volume is the volume of air:
which remains in lungs after maximal expiration inspired and expired during one breath at the end of normal respiration if expiratory muscles are actively contracted which can be inspired over and above resting tidal volume none of the choices are correct
In which of the following tissues would low oxygen levels cause vasoconstriction?
A. Skeletal muscle B. Heart C. Brain D. Lungs
In large arteries, the thick layer of elastic fibers is called the
A) tunica intima. B) external elastic membrane. C) tunica media. D) internal elastic membrane. E) tunica externa.
Vigorous physical activity causes total metabolic rate to
A. decrease during the exercise and for hours afterwards. B. increase during the exercise and for hours afterwards. C. increase for the duration of the exercise. D. remain constant. E. decrease to conserve energy during the exercise but increase to repay oxygen debt.