Which of the following is NOT a major function of skeletal muscle? maintaining body temperature lining hollow organs maintaining posture storing nutrient reserves Answer: b

How would a drug that blocks acetylcholine release affect muscle contraction? Contraction would be prevented. Contraction would be slowed. The speed of contraction would increase. The strength of contraction would increase. Answer: a

Which of these describes the neuromuscular junction? the surface containing membrane receptors that bind acetylcholine special intercellular connection between axon branches and a skeletal muscle fiber the link between generation of an action potential and the start of muscle contraction a propagated change in membrane potential that travels the length of an axon Answer: b

How are epimysium, perimysium, and endomysium interrelated? They are connective tissues and blend with tendons to provide firm attachments to bone. All three contain capillaries and nerves. All three contain satellite cells that function in the repair of muscle tissue. None of the above are correct. Answer: a

Myofibrils are organized into repeating subunits called _____. T tubules Z lines sarcomeres sarcoplasmic reticulum. Answer: c

Where would you expect the greatest concentration of Ca2+ in resting skeletal muscle to be? in T tubules surrounding the mitochondria within sarcomeres in cisternae of the sarcoplasmic reticulum Answer: d

What would you expect to happen to a resting skeletal muscle if the sarcolemma suddenly became very permeable to Ca2+? increased strength of contraction decreased cross-bridge decreased ability to relax both A and C Answer: d