Name B. Multiple Choice (Please encircle one letter for each correct answer!) 1.

Question

Name B. Multiple Choice (Please encircle one letter for each correct answer!) 1. When contraction occurs a. the H zone and the I bands get smaller b. the Z lines move closer together c. the width of the A band remains constant d. all of the above 2. In which of the following would the ratio of motor neurons to muscle fibers be the greatest? a. large muscles of the arm b. postural muscles of the back c. muscles that control the eye d. leg muscles 3. A person who runs marathons will have morein their leg muscles. 1. fast fibers 2. slow fibers 3. intermediate fibers 4. noncontractile fibers 4·The following is a list of the events that occur during a muscle contraction: 1. Myosin cross bridges with actin. 2. Calcium ions are released from the sarcoplasmic reticulum. 3. The myosin head pivots toward the center of the sarcomere. 4. A calcium ion binds to troponin. 5· The myosin head binds an ATP molecule and detaches from actin. Encircle the correct sequence of events (a)1,3,5,4,2 (b)1,2,4,13,5 (c)2,4135 (d)4,1,3,52

Explanation / Answer

Ans

H- Lighter band formed by myosin filament , thick filament

A- Dark band which is formed by myosin and actin filament

I- Light band formed by actin filament

Z- It is short element which interconnect actin filament in adjoining sarcomere.

So (d) option is correct

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