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Week 6 Study Questions - Week 6 Study Questions You will...

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Week 6 Study Questions You will best learn about muscle physiology and membrane potentials is by using WileyPLUS. Look to the Week 5 and 6 Objectives for direction as to some places to look on WileyPLUS and if you need more information on action potentials feel free to look ahead to Chapter 12: Nervous Tissue (p. 426-442) as a reference only – we will not be going into this much detail until Z332. 1. What is a muscle fiber twitch? What are the 3 phases of a muscle fiber twitch? a. Draw a graph of a muscle twitch with time on the x axis and muscle tension (or force) on the y axis. If the stimulus occurs at time 0, when does the tension start to increase? What is the delay between the time of stimulus and the time when tension increases called? What causes this delay? What is happening as the tension increases? What is happening as the tension decreases? 2. Some muscles contract faster than other muscles. The ones that contract faster are called fast twitch. The ones that contract slower are called slow twitch. How might the shape of the fiber twitch graph change for these different fiber types? (Hint: Lecture 2, Slide 7 “Tension in a Twitch”) 3. When is the myosin in the high energy state? How did it become so? (Remnant from Week 5, touched upon this week) 4. Tension is the amount of pull that a muscle fiber exerts on the connective tissues in a muscle. What ultimately determines the amount of tension that a single muscle fiber can generate? How can you vary the amount of tension that a single muscle fiber exerts (see following questions)? Can you stimulate only one part of the muscle fiber, but not another (only some sarcomeres in an individual fiber but not others)?
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