Cross bridges
a. bind to actin during muscle contraction
b. are globular heads made of myosin
c. do not bend during muscle contraction
d. have characteristics a and b
e. have characteristics b and c
D
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What fluid-filled sac surrounds the fetus?
A) amnion B) placenta C) chorionic villi D) umbilical cord E) mesoderm
All of the following structural changes found in the heart occur with the normal aging process, except
A. hypertrophy of the left ventricle. B. decreased elasticity of large vessels. C. decreased valve flexibility. D. atrophy of conduction cells. E. increased elasticity of large vessels.
Some surgical procedures involve lowering a patient's body temperature during periods when blood flow must be restricted. What effect might this have on enzyme-controlled cellular metabolism?
What will be an ideal response?
Which activity of the nephron will remove unwanted substances from the filtrate?
A) collecting system B) glomerular filtration C) tubular reabsorption D) tubular secretion