The epithelium of the seminiferous tubules consists of
A) interstitial cells and sustentacular cells.
B) adipose cells and chondrocytes.
C) spermatogenic cells and sustentacular cells.
D) spermatogonia and spermatids.
C
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The different tracts within indirect motor pathways are grouped according to their primary functions. The medial pathway regulates
A. and controls precise, discrete movements and tone in flexor muscles of the limbs. B. smooth muscle contraction in the viscera. C. muscle tone and gross movements of the muscles of the head, neck, proximal limb, and trunk. D. respiratory rhythm and CO2 levels. E. heartbeat and controls blood pressure.
You notice that you cannot read your book through a test tube of patient fluid held against the print, making it so blurred as to be unreadable. There is no precipitant in the bottom of the beaker, though it has been sitting for several days in a rack. What type of liquid is this?
A) suspension B) colloid C) mixture D) solution
Which of the following events occurs during the lag phase of a muscle twitch?
A. Ca2+ are pumped back into the sarcoplasmic reticulum. B. Muscle fibers shorten. C. Cross-bridges form, move, release, and reform many times. D. The action potential is propagated from presynaptic to postsynaptic membrane. E. All of these events occur in the lag phase.
The hilum of the lung
A. is an indented area through which the bronchi, pulmonary vessels, lymphatic vessels, and nerves pass. B. is the point of exit of exhaled air. C. is the point of entrance for inhaled air. D. is an elevated area through which the trachea, pulmonary vessels, and nerves pass. E. serves to anchor all pulmonary structures to the mediastinum.