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Muscle_Study_Questions - Muscle Study Questions(select the...

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Muscle Study Questions (select the single BEST answer) 1. Which of the following affects transmission at the neuromuscular junction by blocking the neurotransmitter receptor sites on skeletal muscle? A) black widow venom B) curare C) toxin (from Clostridium botulinum ) which causes botulism D) nerve gases and organophosphate insecticides E) all of these 2. When an action potential occurs in the axon terminal of a somatic motor neuron, which of the following normally occurs? end plate potential in the motor end plate membrane 3. Which of the following remains the same size (does not shorten) when the sarcomere shortens? band and the H zone 4. Transport of Ca ++ into the sarcoplasmic reticulum (SR) __________ ATP. A) requires B) does not require 5. The cross bridges of myosin are molecules 6. The sarcomere A) is the unit of skeletal muscle contraction B) extends from one Z line to the next Z line C) both A and B D) neither A nor B 7. The ATP that supplies the energy for the power stroke is broken down to ADP and phosphate ion _____ the power stroke. A) before B) during 8. Skeletal muscle contraction occurs (is "turned on") when __________ binds to _____________. 9. Select the choice that lists the numbered events below in the proper order . (Some events may be missing.) 1) tropomyosin moved away from the cross bridge binding sites on actin 2) action potential in T tubule 3) release of Ca ++ from the sarcoplasmic reticulum (SR) 4) action potential in sarcolemma 10. Rigor mortis occurs because _____________ levels in the skeletal muscle cell decrease and _________ cannot detach from ___________. 11. Which of the following is the first (and fastest) source for supplying ATP for skeletal muscle contraction? A) aerobic pathway (Kreb's cycle and the electron transport chain) B) anaerobic pathway (glycolysis) C) creatine phosphate (phosphocreatine) 12. Which of the following produces ATP faster?
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