When nicotinic receptors on the motor end plate are stimulated by acetylcholine,

Question

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

Explanation / Answer

42)d. sodium ions enter the muscle cell though the t- tubules.

43) b.forcing blood from the heart into the major arteries

44) d, Transervse tubules.Transverse tubules (T-tubules)

45)d.active transport of calcium into the Terminal cisternae.

46)a. the myosin head would remain in the high energy state so the muscle cell contract to complete tetanus.

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