FS18 Homework for Unit 2 READY TO POST.pdf

Hint page 112 and 115 of the course pack will help a

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in the bath most likely prevent? (Hint: page 112 and 115 of the Course Pack will help). A) action potentials B) presynaptic knob neurotransmitter release C) opening of chemically gated ion channels after neurotransmitter binds D) all EPSPs and IPSPs E) binding of neurotransmitter to chemically gated ion channels 5. (Hint: The Challenge Questions and Reading Questions will help with this – this question is to remind you to do those questions and to give you credit for working through those questions – BUT DO THIS QUESTION FIRST BEFORE LOOKING AT THE ANSWER!!!! ) Imagine you are able to keep skeletal muscle cells in a fluid bath that is exactly like extracellular fluid, except that it contains no Ca ++ (contains no calcium ions). Assume that the muscle cells in this bath are healthy and undamaged. Assume also that you are set up to stimulate (depolarize) the skeletal muscle cells to cause action potentials in the muscle cell membrane. Which below could occur (is possible) when you depolarize the muscle cell membrane? (Hint: page 176-177 of the Course Pack should help.) A) action potentials but no contractions B) contractions but no action potentials C) action potentials and contractions 6. All of the following are associated with a withdrawal reflex EXCEPT A) monosynaptic reflex B) somatic motor neurons C) EPSPs (excitatory postsynaptic potentials) in neurons going to (that innervate) the agonist (flexor) D) IPSPs (inhibitory postsynaptic potentials) in neurons going to (that innervate) the antagonist (extensor) E) interneurons 7. Which of the following remains the same length (does not shorten) when the sarcomere shortens?
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3 8. In skeletal muscle, _____ binding to ________ breaks the rigor complex (causes detachment of myosin from actin). In skeletal muscle, active transport of _____ _______ the sarcoplasmic reticulum (SR) causes relaxation. troponin, Ca ++ , into 9. Fast glycolytic fibers have more __________ than slow oxidative fibers. 10. Consider the following numbered events from 1) to 15). Which 2 events are in the wrong order? (Hint: pg. 161-162 and 176-177 of the Course Pack; you should use this question to help you understand the correct order of the events!) (Another Hint: the Extra Study Questions for Muscles BUT DO THIS QUESTION FIRST BEFORE YOU LOOK!!) 1) Action potential in somatic motor neuron 2) Opening of Ca ++ channels in somatic motor neuron axon terminal 3) Release of acetylcholine from axon terminal 4) Diffusion of acetylcholine across cleft of neuromuscular junction 5) Binding of acetylcholine to receptors on motor end plate 6) End plate potential 7) Opening of voltage gated Na + channels in sarcolemma 8) Action potential in sarcolemma 9) Action potential in T tubules 10) Opening of Ca ++ channels in SR 11) Release of Ca ++ from SR 12) Movement of tropomyosin (away from cross bridge binding sites) 13) Binding of Ca ++ to troponin 14) Binding of myosin cross bridges to actin 15) Power stroke A) 2 and 3 B) 5 and 6 C) 6 and 7 D) 9 and 10 E) 12 and 13
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  • Fall '10
  • AdeleDenison

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