QUESTION 8 Which of the following is true about rigor mortis? O A. The muscle relaxes because there is no ATP. O B. The muscle remains contracted because muscle relaxation requires ATP and it is no longer produced. C. Calcium is removed and pumped back into the sarcoplasmic reticulum. OD. It peaks 72 hours after death. ง

QUESTION 8 Which of the following is true about rigor mortis? O A. The muscle relaxes because there is no ATP. O B. The muscle remains contracted because muscle relaxation requires ATP and it is no longer produced. C. Calcium is removed and pumped back into the sarcoplasmic reticulum. OD. It peaks 72 hours after death. ง

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Similar questions

Which of the following statements relating to the factors affecting the force of muscle contraction is false? a. skeletal muscles contract strongest when the muscle fibers are 80-120% their resting length b. low frequency of stimulation generates decreased force c. larger muscle fibers can generate more tension to generate stronger contractions d. more motor units recruited causes stronger contractions e. none of the above
Muscle contractions where the muscle shortens but tension remains constant are called A. isometric B. hypermetric C. hypotonic D. isotonic E. hypertonic
QUESTION 9 Which of the following is true about skeletal, smooth and cardiac muscle? OA. They are all striated. B. They all have varicosities. C. They are all multinucleated. O D. They all have actin and myosin. W
QUESTION 8 How does the nervous system grade the force of muscle contraction? O a. Only by recruiting additional motor units O b. Only by varying the firing rate of the motor neurons O c. By varying the firing rate of the motor neurons and by recruiting additional motor units O d. By using more motor neuron pools
When motor units are recruited to participate in tension development in a muscle, the order of recruitment is typically: Question 13 options: from slow twitch to fast twitch from fast twitch to slow twitch it depends on the type of contraction related to the size and shape of the muscle
44.
Describe what is happening to the following parts of a sarcomere during muscle contraction. a. H band b. I band c. A band d. Z lines
Which of the following muscle proteins isnot intracellular?a. actinb. myosinc. collagen
just little explanation on this is needed
Question 2 During which step of a muscle contraction cycle is ATP needed? when myosin head does a power stroke and release of calcium ions into sarcoplasm when myosin head detaches from actin and release of calcium ions into sarcoplasm when myosin head does a power stroke and pumping of calcium ions back into SR when myosin head detaches from actin and pumping of calcium ions back into SR
Which of these statements concerning aging and skeletal muscle iscorrect?a. A loss of muscle fibers occurs with aging.b. Slow-twitch muscle fibers decrease in number faster than fast-twitchmuscle fibers.c. The loss of strength and speed is due mainly to loss of neuromuscular junctions.d. The density of capillaries in skeletal muscle increases.e. The number of motor neurons remains constant.
A new experimental drug is tested in muscle fibers and it is concluded that it blocks the calcium channels in the sarcoplasmic reticulum. Which of the following are expected consequences of the injection of this drug in skeletal muscles?