CITY UNIVERSITY OF N Name May 3, 201125 Spring 1 2011 Lecture Quiz 4 1. Which te
ID: 3519318 • Letter: C
Question
CITY UNIVERSITY OF N Name May 3, 201125 Spring 1 2011 Lecture Quiz 4 1. Which term refers to the ability of a muscle to return to its original length after getting stretched? A Extensibility. B. Contractility. C. Elasticity. D. Excitability. E. None of the above. 2. Which describes BOTH smooth and cardiac muscle? B. Involuntary E. None of the above. C. Striated D. Branched cells 3. Which area of the sarcomere will INCREASE in size during muscle RELAXATION? A. H zone. B. A Band. C. I band D. Zone of overlap. E. None of the above. 4. Which is CORRECT statement about a protein of the THIN filament? B. Titin is a very large protein A. Myosin heads contain an ATPase. C. Tropomyosin functions to cover the myosin binding sites on actin. D. Defects in dystrophin causes muscular dystrophy. E None of the above. 5. Which is CORRECT about the connective tissue layers of skeletal muscle? A The perimysium surrounds the entire muscle. B. The epimysium surrounds each fascicle. C. The endomysium surrounds each muscle fiber D. The perimysium is continuous with the tendon. E. The epimysium immediately surrounds the sarcolemma. 6. Which is the function of acetylcholinesterase? A It synthesizes acetylcholine. B. It breaks down acetycholine. C. It pumps acetylcholine. D. It releases acetylcholine. E. None of the above. 7. Which best describes acetylcholine? C. It is a neurotransmitter. A. It is a channel. D. It is an enzyme. B. It is a structural protein. E. None of the above.Explanation / Answer
(1)C.Elasticity
Muscle elasticity is the ability of your muscles to extend in an activity and resume their contracted position.
(2)B.involuntary
contraction of smooth muscle and cardiac muscle is not under voluntary control (involuntary)
(3)A, H Zone
The width of the H zone decreases during a contraction and increases during relaxation.
(4)C.Tropomyosin functions to cover the myosin binding sites on actin.