Fifth exam Anatomy and Physiology Name Extending the length of a muscle prior to

Question

Fifth exam Anatomy and Physiology Name Extending the length of a muscle prior to contraction will increase the force of the contraction. a. True b. False Oxygen debt following exercise results from a build-up of lactic acid in muscle tissues during anaerobic respiration a. True b. False For a muscle to begin contracting, which of the following must occur? a. Calcium ions must be actively pumped from the sarcoplasm to the sarcoplasmic reticulum b. Calcium ions must be detached from troponin c. Troponin must bond with an ATP molecule d. Tropomyosin must shift to reveal bonding sites present on actin 1. 2. 3. e. None of the above are true 4. Myosin heads can exist in two positions depending on whether an ATP molecule is attached. a. True b. False Which of the following muscle types is responsible for peristalsis in the digestive tract? a. Cardiac b. Skeletal c. Smooth d. All of the above Heat is produced in muscles as a result of the inefficient conversion of glucose to motion. a. True b. False Which of the following is not part of the thin myofilament in muscle fibers? a. Actin b. Myosin c. Troponin d. Tropomyosin The area in the brain responsible for temperature control in the body is the a. Pituitary b. Hypothyroid c. Hypothalamus d. Cardiac muscle When the sarcomere contracts in an isotonic contraction, the I bands become smaller a. True b. False s. 6. 7. 8. 9. 10. Cross bridges are formed when: a. b. c. d. An activated myosin head attaches to tropomyosin An activated myosin head attaches to troponin An activated myosin head attaches to actin An activated myosin head attaches to ADP

Explanation / Answer

1. True. Force of contraction depends on length of muscke fibers before contraction.

2. True. Lactic acid is a by product of anerobic respiration. The amount of oxygen required to oxidize lactic acid is lacking during exercise. Hence we breathe deeply after exercise.

4. True. Myosin head changes into cocked position depending on hydrolysis of atp.

5. C. Smooth muscle helps in peristalsis.

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