What is the function of cholesterol in the plasma membrane?
A. To maintain rigidity of the plasma membrane
B. To make the membrane more resistant to freezing
C. To form receptor molecules
D. To increase the fluidity of the membrane
E. To restrict the entry of most molecules
D. To increase the fluidity of the membrane
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PAF is released from the ____________________ lining of vessels
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Hyposecretion of an endocrine gland may have a genetic basis
Indicate whether the statement is true or false
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.
A decrease in muscle bulk due to a lack of exercise, as when a limb is in a cast for a prolonged period, is known as ____.
Fill in the blank(s) with correct word