exam 2study questions

exam 2study questions - STUDY NOTES/OUTLINE MUSCLE...

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STUDY NOTES/OUTLINE 1. What are the three layers of connective tissue and the location of each? Epimysium – outer, around the entire muscle, Perimysium – middle, surrounding individual bundles of muscle fibers, Endomysium – inner, tissue between individual fibers 2. What do muscle fibers contain? Myofibrils 3. How many capillaries supply an average muscle fiber? 3-4 4. How many capillaries supple muscle fiber with training? 5-7 5. What is a tendon? Attach muscle to bone, stronger/tougher than muscles, small tendon can withstand tension generated from a larger muscle 6. How do tendons compare to muscle fiber in terms of strength and elasticity. Less stretchy 7. What type of nerves innervate your muscles? Motor neurons 8. What is a motor unit? A single motor nerve and all the fibers it innervates 9. What determines the fiber:nerve ratio? The amount of force needed for movement activation 10. What is the “all or none” law? A muscle fiber contracts maximally or not at all 11. What is the principle of “gradation”? the size of the motor axon supplying the motor unit determines whick “fires” first Small>Large 12. how does the principle of “gradation” affect movement? The seize of the motor axon supplying the motor unit determines which “fires” first 13. What two factors determine the force of any given muscular contraction? The threshold of activation and number of fibers 14. Which motor units are activated first? Low threshold motor units (slow twitch) 15. Do low threshold motor units typically produce a small or large amount of force? 16. Units that produce greater amounts of force have a HIGHER threshold of activation and a high number of fibers. 17. The ramp-like recruitment seen during muscular contraction ensures that the easily fatigued, FAST twitch fibers are protected because the slow twitch fibers will always be recruited first. 18. The functional capacity of a motor unit is determined by the type of MUSCLE FIBERS that make up the unit. 19. Slow twitch fibers have a SLOW speed of contraction and a LOW force production. 20. Fast twitch fibers have a FAST speed of contraction and a HIGH force production. 21. Describe an intermediate fiber in terms of speed of contraction and force production. Contract faster thana slow twitch but slower than fast twitch. Also, they generate more force than slow twitch but less force than fast twitch. More fatigue resistance than fast twitch but less than slow twitch 22. How will fiber type vary among individuals? Power athlets tend to have more fast twitch. Endurance – slow 23. How will fiber type vary within the same individual? Mixture 24. Will training affect whether you have predominately slow twitch or fast twitch muscle fibers? No the composition of muscle fibers is mostly genetic, fast twitch cannot be changed to slow 25. How does training affect muscle fibers? Intermediate fibers can be trained to perform more similar to the desired fiber type EX. marathon runner can train their intermediate fibers to perform more similar to slow twitch
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26. What type of athletes tend to have more slow twitch muscles fibers?
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This note was uploaded on 03/21/2012 for the course KIN 310 taught by Professor Stanforth during the Spring '06 term at University of Texas.

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exam 2study questions - STUDY NOTES/OUTLINE MUSCLE...

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