280 Chapter Eleven The Muscular system: Muscle structure and Function Exercise 1

Question

280 Chapter Eleven The Muscular system: Muscle structure and Function Exercise 11.9: Motor Units and Muscle Fatigue (Human subject) 13. Match the characteristic listed in column Awith the muscle fiber type listed in column B.Answers may be used more than once. Column A Column B 1. fast-twitch with high fatigue resistance a. Type I 2. fast-twitch with moderate fatigue resistance lb. Type Ila 3. largest fiber cross-sectional area c. Type IIb 4, slow-twitch with very low fatigue resistance 5. smallest fiber cross-sectional area 14. Rank the motor units in the order of recruitment as increased force is demanded of skeletal muscle. 4 a. Type I b. Type Ila c. Type IIb 15. If a muscular contraction requires the recruitment of Type Ilb muscle fibers, the force produced will be (high/ow), the speed of contraction will be fastslow), and the contraction (wiwwil not be able to be sustained for a significant length of time. 15 Exercise 11.10: Contraction of Skeletal Muscle (Wet Lab) 16 Adding which of the following solutions to the glycerinated muscle preparation resultedincontraction? (Check all that apply) a. ATP only b. salts only c, ATP salts (True/False) 17. When the supply of ATP in a muscle runs out, sin heads remain detached from actin. Exercise 11.11: Ph.I.LS. Lesson 5: s-Dependent Force Generation

Explanation / Answer

Question number 13:

Type IIb - Fast-twitch with high fatigue resistance

Type IIa - Fast-twitch with moderate fatigue resistance

Type IIb - largest fiber cross sectional area

Type I - Slow-twitch with very low fatigue resistance

Type I - Smallest fiber cross sectional area

Note: As per the guidelines we can answer only first question. So, I did not answer the remaining questions. Hope you can understand.

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