280 Chapter Eeven The Muscalar Sstem: Muscle Smacture and Frwscaion Exercise 119

Question

280 Chapter Eeven The Muscalar Sstem: Muscle Smacture and Frwscaion Exercise 119: Motor Units and Muscle Fatigue (Human Subject 13. Match the characteristic listed in column A with the musele fber type listed in column B. Answers may beusedmore Column B Column A fast twitch with high fatigue resistance lb. Type Ila 2. fast-twitch with moderate fatigue resistance c, Type IIb 3 largest fiber cross-sectional area slow twitch with very low fatigue resistance 5 smallest fber cross-sectional area 4. Rank the motor unitsin the order of recruitment as increased force is demanded of skeletal muscle. O b, Type Ila c. Type IIb Chighiow), the speed of 15. If a muscular contraction requires the recruitment of Type lub muscle sbers,the force produeed will be (wiNwill not be able to be sustained for a significant (fastslowl and the contraction. ontraction wilbe length of time. Exercise 11.10: Contraction of skeletal Muscle (Wet Lab) 16 Adding which of the folowing solutionstothe glycerinated muscle preparation resulted in contraction? (check allthat apply a ATP only b. salts only c, ATP salts 17, When the supply of ATP in a muscle runs out, myosin heads remain detached from actin Exercise 11.11: PhLLS, Lesson 5: Stimulus-Dependent Force Generation 18 Put the following phases of a muscle twitchin the correct order O a period of contraction b, latent period c period of relaxation 9 Match the description of the stimulus applied to a muscle fiber listed in column Awith the corresponding definition istedin column B. O Column B Column A 1. not strong enough to produce a muscle twitch a subthreshold 2 strong enough to produce a muscle twitch but no summation b suprathreshold 3 stronger than necessary to cause summation c, threshold

Explanation / Answer

Answer no 13.

1.Fast-twitch with high fatigue resistance- Type IIa

2. Fast-twitch with moderate fatigue resistance- Type IIb

3. largest fibre cross sectional area- Type II a

4. Slow twitch with very low fatigue resistance- Type I

5. smaller fibre cross sectional area- Type I

Answer no. 14

The ranking are in decreased order

1. Type IIb

2. Type IIa

3. Type I

Answer no. 15:

If a muscular contraction requires the recruitment of type IIb muscle fibre, the force produced will be high, the speed of contraction will be fast, and the contraction will not be able to be sustained for a significant length of time.

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