55. What characteristic is NOT deseriptive of cardiac muscle tissue? a. intercal

Question

55. What characteristic is NOT deseriptive of cardiac muscle tissue? a. intercalated discs b. striations c. voluntary muscle contractions d. located in the heart 56. The degree to which a muscle cell can stretch depends on its: a. excitability. b. contractility c. extensibility. d. conductivity. 57. The plasma membrane of a muscle cell is known as the: a. myofibril. b. sarcoplasmic reticulum c. sarcolemma. d. sarcomere. 58. Which protein does NOT belong in a thin filament? a. actin b. troponin c. tropomyosin d. myosin 59. A group of skeletal muscle fibers together with the surrounding perimysium form a(n): a. ligament. b. endomysium. c. fascicle. d. myofibril. 60. The central region of the A band that lacks thin filaments is the: a. I band. b. Z disc. c. H zone. d. sarcomere. 61. Which of the following wraps and surrounds an individual skeletal muscle fiber? a. endomysium b. sarcoplasmic reticulum c. perimysium d. epimysium 62. What is the functional contractile unit of the myofibril? a. sarcolemma b. A band c. I band d. sarcomere 63. Which of the following statements is the most accurate description of the sliding fil mechanism? a. Z discs slide over the thick and thin filaments b. both thick and thin filaments shorten c. thick filaments shorten while thin filaments remain unchanged d. thin filaments slide past thick filaments towards the M line. The Na /K+ pump helps a muscle cell maintain a state of a. resting membrane potential. C. propagation d. depolarization. b. action potential

Explanation / Answer

55. C) Voluntary muscle contraction.

Cardiac muscle tissue is an extremely specialised form of muscle tissue that are straited, intercalated and show involuntary muscle contraction with single nucleated muscle fibers.

56. C) Extensibility

The ability of a muscle to be stretched.

57. C) Sarcolemma

Sarco- Flesh, Lemma- sheath

58. d) Myosin

Thin filament of muscle is made up of three proteins namely Actin, Troponin and Tropomyosin.

59. C) Fascicle

60. C) H Zone

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