A & PTest: Chapters 9,10,11 1. True or false: Muscles comprise the largest tissu

Question

A & PTest: Chapters 9,10,11 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. True b. False 2. Muscles are classified either as striated/smooth or voluntary/involuntary. Which of them the somatic nervous system? is innervated by a. unstriated b. involuntary c. voluntary 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 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. 7. myosin where actin and ATP binding sites are present. It does not allow muscle to be stretched. Instead it aids in active recoil that requires additional ATP. c 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. Cat b. Na+ c. Phosphate

Explanation / Answer

1. False

Largest tissue of human body is skin.

2. The somatic nervous system innervates the

C. Voluntary muscles.

3. What percent of muscle consists of myofibrils

C. 60 percent.

4. True

Myofibrils contains proteins actin,myosin ,titin etc.

5. True

Myosin are thicker than actins

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