Cerumen is a secretion that
A. lubricates vellus hairs and waterproofs the skin of the limbs.
B. lubricates the ear canal and traps debris before it reaches the eardrum.
C. cools the body through water evaporation.
D. tends to cause acne on the skin of the face.
E. acts as a pheremone.
B
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Tissue damage by free radicals is prevented to some extent by all of the following EXCEPT ________.
A. vitamin C B. beta-carotene C. vitamin D D. vitamin E
The ________ is equal to the hydrostatic pressure of the blood in the capillaries minus the hydrostatic pressure of tissue interstitial fluid outside the capillaries.
A. blood pressure B. net filtration pressure C. osmotic pressure D. None of the choices are correct.
As blood moves from the arterial end to the venous end of a capillary, net filtration pressure
A. decreases, as blood hydrostatic pressure decreases. B. remains the same, as rises in blood osmotic pressure are offset by declines in tissue osmotic pressure. C. decreases, as blood colloid osmotic pressure decreases. D. increases, as blood hydrostatic pressure rises. E. increases, as blood colloid osmotic pressure rises.
Reflex venous vasoconstriction can completely compensate for gravitational effects without skeletal muscle activity
a. True b. False Indicate whether the statement is true or false