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37 Cards in this Set
- Front
- Back
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Which of the following is NOT a general function of muscle tissue? |
Protection |
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The skeletal muscle fiber characteristics of excitability directly results in these cells being capable of: |
Responding to nerve signals |
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The correct order of arrangement of skeletal muscle cells, from the largest to smallest, is: |
Fiber, myofibril, myofilament |
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Sarcoplasmic reticulum is: a. A system of transverse tubules that extend at a right angle to the long axis of the cell b. A segment of the myofibril between two successive Z lines c. A unique name for the plasma membrane of a muscle fiber d. None of the above |
None of the above |
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Which of the following are myofilament proteins? a. troponin b. tropomyosin c. a and b d. none of the above |
a and b |
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The contractile unit of a myofibril is the: |
sarcomere |
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The chief function of the T tubule is to: |
Allow the electrical signal to move deep into the cell |
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Myosin heads are also called: |
Cross-bridges |
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During muscle contraction, Ca++ is released from the: |
Sarcoplasmic reticulum |
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The region of a muscle fiber where a motor neuron connects to the muscle fiber is called the: |
Motor endplate |
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The principal component(s) of a motor unit is/are: a. one somatic motor neuron b. the muscle fibers supplied by a somatic motor neuron c. none of the above d. both a and b |
both a and b |
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The staircase phenomenon is also known as: |
treppe |
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Skeletal muscles are innervated by: |
somatic motor neurons |
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Which of the following statements concerning isometric contractions is true? |
Muscle length remains constant |
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Physiologic muscle fatigue is caused by: |
Relative lack of ATP |
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Increase in muscle size is called: |
Hypertrophy |
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Endurance training is also called: |
Aerobic training |
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What muscle is located in the walls of hollow organs? |
Smooth muscle tissue |
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What muscle contains many nuclei near the sarcolemma? |
skeletal muscle tissue |
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What muscle is voluntary? |
Skeletal muscle tissue |
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What muscle is NOT striated? |
Smooth muscle tissue |
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What muscle is striated and contains a single nucleus? |
Cardiac muscle tissue |
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What muscle has a principal function: peristalsis? |
Smooth muscle tissue |
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What muscle has larger-diameter T tubules that form diads with sarcoplasmic reticulum? |
Cardiac muscle tissue |
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What muscle contains intercalated disks? |
Cardiac muscle tissue |
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What muscle has loosely organized sarcoplasmic reticulum? |
Smooth muscle tissue |
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Muscle strains are characterized by: |
Myalgia |
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Crush injuries can cause _______ to accumulate in the blood and result in kidney failure. |
Myoglobin |
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A viral infection of the nerves that control skeletal muscle movement is known as: |
Poliomyelitis |
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_______ is a group of genetic diseases characterized by atrophy of skeletal muscle tissues. |
Muscular dystrophy |
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________ is an autoimmune disease in which the immune system attacks muscle cells at the neuromuscular junction. |
Myasthenia gravis |
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When the muscle does NOT shorten and NO movement results, the contraction is: |
Isometric |
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Pushing against a wall is an example of which type of contraction? |
Isometric |
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Prolonged inactivity causes muscles to shrink in mass, a condition called: |
Disuse atrophy |
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Muscle fibers usually contract to about ____% of their starting length. |
80 |
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Which statement is true of smooth muscle? a. it lines the walls of many hollow organs b. It is striated c. It is voluntary d. There are many T tubules throughout smooth muscle |
It lines the walls of many hollow organs |
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What is a quick, jerky response of a given muscle to a single stimulus called? |
Twitch |
