7 muscle flashcards.doc

Extensibility 51 which characteristic of skeletal

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Extensibility 51. Which characteristic of skeletal muscle allows the fibers to recoil to their original length after being stretched? Elasticity 52. Which characteristic of skeletal muscle allows the fibers to stimulated by a nerve? Excitability 53. Muscle myofibrils contain what two proteins? Actin and myosin 54. What is it that contracts in muscle? The sarcomere 55. What is the basic structural and functional unit of skeletal muscle? Sarcomere 56. What is a single muscle cell called? Muscle fiber or myofiber 57. What are the two types of myofilaments? Actin (thin) and myosin (thick) 58. Do actin and myosin shorten? No, they just slide past each other 59. When does the sliding filament mechanism begin? When calcium ions bind to the myofilament. 60. Which myofilament does calcium bind onto? The thin (actin filament)
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Muscles Flashcards 61. Where is calcium stored for muscle contraction? Sarcoplasmic reticulum 62. To which myofilament does ATP attach in a muscle fiber? ATP attaches to the myosin filament 63. What is required for muscle relaxation? ATP 64. What neurotransmitter is used for contraction of skeletal muscle, and on what region does it land on? Acetylcholine, which is released onto the region known as the end plate 65. What two proteins wrap around actin? Tropomyosin and troponin 66. What specific molecule on actin is the binding site for calcium? Troponin 67. What covers the actin filament when muscle is relaxed? Tropomyosin and troponin 68. Which protein blocks the attachment site for myosin heads? Tropomyosin 69. What size motor unit will supply less strength and more precision? Small motor unit NOTE: questions in yellow are for A&P students only. They are physiology questions that are not for the Anatomy students. 70. Muscle fibers exist in what two basic forms? Fast twitch and slow twitch 71. Which form has relatively few mitochondria that generate most of their ATP via glycolysis, so they have low resistance to fatigue, and they wear out quickly Fast twitch 72. What phase of muscle contraction is the time between the application of a stimulus and the beginning of contraction? lag phase 73. What phase of muscle contraction is the time of contraction? contraction phase 74. What phase of muscle contraction is the time during which the muscle relaxes? relaxation phase 75. What phase of muscle contraction is the time between muscle twitches? refractory period 76. The force of contraction produced by a muscle is increased in what two ways? Summation and recruitment 77. Which way involves increasing the force of contraction of the muscle fibers within the muscle by rapidly stimulating them? Summation 78. Which way involves increasing the number of fibers contracting? Recruitment 79. What is an example of an isometric Pushing against a wall
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Muscles Flashcards contraction?
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  • Fall '08
  • Harrison,C
  • muscle spasms, Muscles Flashcards

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