42) When nicotinic receptors on the motor end plate are stimulated by acetylchol

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42) When nicotinic receptors on the motor end plate are stimulated by acetylcholine, sodium ions leave the muscle cell through the T-tubules. B) sodium ions enter the muscle cell from the extracellular fluid. potassium ions enter the muscle cell from the terminal cisternae D) potassium ions enter the muscle cell from the extracellular fluid. E) sodium ions enter the muscle cell from the terminal cisternae. 43) Which of the following is NOT a function of smooth muscle tissue? A) moving food materials along the digestive tract B) forcing blood from the heart into the major arteries elevating hairs on the arm C) E) None of the above. are conducted deep into a skeletal muscle cell by A) motor end plates. D) neuromuscular junctions. 45) The most important factor in decreasing the intracellular concentration of calcium in skeletal mus contraction is A) active transport of calcium into the terminal cisternae. active transport of calcium into the synaptic cleft. O diffusion of calcium out of the cell (into the extracellular fluid). D) active transport of calcium across the sarcolemma. diffusion of calcium into the sarcoplasmic reticulum 46) What would happen to a skeletal muscle if acetylcholinesterase is inactivated? A) It would be paralyzed (flaccid paralysis). It would partially contract (low tension) D) It would contract to complete tetanus. E) The myosin heads would remain in their high energy state so the muscle would contract tetanus.

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