13. What bone tissue component(s) decrease(s) in one with osteoporosis? A. The m

Question

13. What bone tissue component(s) decrease(s) in one with osteoporosis?

A. The mineral salts that give bone its hardness.

B. The collagen that gives bone its tensile strength.

C. Both A and B

D. None of the above is true because osteoporosis involves a loss of only bone cells.

14. When skeletal muscles contract concentrically, they shorten. What doesn't shorten?

A. The fascicles

B. The muscle fibers

C. The myofibrils

D. The myofilaments

E. None of the above

15. What direct role does acetylcholine have in muscle contraction?

A. It binds to tropomyosin.

B. It removes the myosin-binding site.

C. It binds to the motor end plate, causing excitation of the muscle fiber.

D. All of the above are true.

Explanation / Answer

13. D Osteoporosis is due to cells known as osteoclasts which are essentially bone destroying cells. This has nothing to do with minerals. It leads to overall decrease in bone mass only.

14. Concentric contraction is the type of contraction where the length of the muscle decreases.

15. C. Acetylcholine is a neurotransmitter. It binds to the motor end plate of the neuromuscular junction and causes excitation of the muscle fibre.

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