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241 2009- 2nd- b - 42 During an isometric contraction the...

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Unformatted text preview: 42. During an isometric contraction the muscle origin moves toward the muscle insertion. a. True False 43. Fatty acids supply energy for muscle contraction during high intensity, anaerobic contractions. a. True False 44. Myasthenia gravis is an autoimmune diseases that is characterized by the 1955,9facetylcholine receptors on skeletal muscle membrane, resulting in muscle weakness. Which of the following drugs might be used to treat the condition? a. curarex b. drugs that inhibit acetylcholinesterase 0. drugs that block acetylcholine receptors botox injections e. calcium channel blockers 45. Stretching a muscle to its maximal length will maximize its ability to produce tension. a. True CE False 46. The smallest fimctional unit of skeletal and cardiac muscles, a sarcomere, is composed of specific overlapping proteins. The contain energy consuming ATPase activity. i Q myosin b. actin c troponin d. tropomyosin e transverse tubules 47. During the contraction of a skeletal muscle that produces shortening, which of the following events would occur? a. Z lines move farther apart X b. A band becomes wider ;< G} 1 band becomes shorter (narrower) / d. Sarcomere becomes longer x e. H zone becomes wider f 48. Which of the following is characteristic of multiunit smooth muscle? aflunits are electrically linked via gap junctions élfi discrete units may be separately stimulated by nerves to contract c. sthey are also known as visceral smooth muscle d. Ksometimes described as a functional syncytium e. because they are multiunit, they have a striated appearance, similar to that of skeletal muscle 49. Single-unit smooth muscle is found in organs like the uterus and urinary bladder. E) True d. False 50. The alpha-motor neurons that stimulate the quadriceps muscle of the thigh are found in the motor cortex of the brain do not directly stimulate the muscle to contract are found in the ventral horn of the spinal cord . release calcium directly onto the muscle cell to produce contraction ® also stimulate the muscle spindle fibers mess-P ...
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