1 True or false: Muscles comprise the largest tissue in the human body and make

Question

1 True or false: Muscles comprise the largest tissue in the human body and make up about 40% of male body weight and 32% female body weight. a. Tre h. False 2. Muscles are classified cither as striated smooth or voluntary finvoluntary. Which of them is innervated by a. unstriated b involuntary e. voluntary the somatic nervous system? 3, what % of skeletal muscle fibers consist of myofibrils? a.80 b. 70 c. 60 4. True or false: Myosin is not part of a myofibril. a. True b. False 5. True or false: Myosin is considered to be thicker than actin a. True b. False 6. Which of these describes the area between 2 Z lines and is considered the functioning unit of muscle? a. Myofibril b. M lines c. Sarcomere 7. Why is the protein Titin so significant to the muscle system of the human body? a. It helps muscle stretched by external force passively recoil back to its resting length. b. It helps the functioning unit of the muscle bind to troponin and hold tropomyosin onto the globular head of myosin where actin and ATP binding sites are present. c. It does not allow muscle to be stretched. Instead it aids in active recoil that requires additional ATP. 8. Thin filaments consist of 3 proteins. Which one is responsible for stabilizing tropomyosin? a. actin b. troponin c. actin and troponin 9. Which of these forms the back bone of the thin filament? a. actin b. troponin c. actin and troponin 10. During muscle contraction which of these competes with troponin? a. Ca+ b. Na+ c. Phosphate

Explanation / Answer

1. True [ muscle tissue is the largest tissue in the human body ]

2. c voluntary [ Somatic nerves supplies the voluntary muscle system ]

3. a.) 80 %

4. False [ myosin is one of the main myofibrils]

5. True [ myosin are thicker than actin]

6. c sarcomere [ the area between two consecutive Z line are called sarcomere ]

7. a) it helps muscle stretched by external force passively recoils back to its resting length [ titin is the main protein fibers which stretch and recoils back ]

8. b. troponin stabilize the tropomyosin

9. a) Actin

10. a) Ca++

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