The plasma membrane of a skeletal muscle fiber is called the ________.
Fill in the blank(s) with the appropriate word(s).
sarcolemma
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Compact bone has ________, whereas spongy bone has ________.
A. trabeculae; osteons B. spaces that reduce the weight of bone; tightly packed matrix that is solid C. osteons; trabeculae D. osteocytes; no osteocytes
The reason much of the blood in the fetal right atrium is shunted to the left atrium through the foramen ovale is
A. the blood pressure in the left atrium is greater than in the right atrium. B. the fetus is in an antigravity situation provided by the amnionic fluid. C. there is a valve that directs the blood that way. D. the umbilical arteries have valves. E. the blood pressure in the right atrium is greater than in the left atrium.
The specificity of hormones is due to
a. specialized hormone secretion b. molecular rearrangement at the site of action c. specific binding of hormones to plasma proteins d. specialization of target-cell receptors e. inactivation of hormones by the kidneys
The palate separates
A. the small and the large intestine. B. the oral and nasal cavities. C. the esophagus and the larynx.