Which of the following is not a feature that connective tissues have in common?
A. Very conspicuous fibers
B. Ground substance with a gelatinous to rubbery consistency
C. The presence of collagen
D. A calcified matrix
E. The presence of fibroblasts
Answer: D
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Which of the following is not a way that red blood cell shape is significant?
A) It gives the red blood cell a large surface area to volume ratio. B) It allows fast exchange of gases between the inside of the cell and the plasma. C) It enables red blood cells to form stacks. D) It allows red blood cells to bend and flex. E) It enables red blood cells to phagocytose bacteria.
Cellular responses to hormones that initiate second-messenger systems include ________.
A) possible activation of several different second-messenger systems B) cyclic AMP phosphodiesterase formation of an active second messenger C) formation of a specific protein kinase that acts on a series of extracellular intermediates D) hormone binding to intracellular receptors
Which are characteristics used in the naming of muscles? Select all that apply.
A. Origin and insertion B. Agonist or antagonist C. Size and shape D. Region of the body E. Class of lever
The long length of the cardiac action potential, at 200-300 msec, allows for:
A) less calcium ions to enter cells. B) a reduction in strength of the heart's contraction. C) a faster heart rate. D) an opportunity for the heart to fill with blood.