What is the function of collagen fibers in the skin?
A. Extensibility
B. Strength
C. Cushioning
D. Elasticity
Answer: B
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A champion weight lifter picks up a pencil. A minute later she picks up a sixty-pound object using the same muscles. What was different about the two movements?
Also, what are the differences (at the cellular and molecular levels) in her arm muscles as compared to those of a weaker, untrained person? What will be an ideal response?
Explain how these statements differ, and identify which one(s) is/are correct. Explain what is wrong with each incorrect statement. Explain when chemical reactions continue and when they stop.
A. A chemical reaction proceeds until the enzyme molecules are all consumed. B. A chemical reaction proceeds until the substrate molecules are all consumed. C. A chemical reaction proceeds until equilibrium is established. D. A chemical reaction proceeds until all the product molecules are removed.
During the peak of the action potential, the membrane becomes most permeable to
a. sodium b. potassium c. calcium d. chloride e. protein
Long-term mechanisms control blood pressure by:
A. regulating vasoconstriction. B. releasing norepinephrine from the adrenal gland. C. regulating blood volume. D. regulating heart rate.