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16 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Which of the following is NOT a protein found in myofibrils? |
Tubulin |
A. Tubulin B. Tropomyosin C. Myosin D. Actin |
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The specific part of the sarcomere structure that is only occupied by thick filaments and is lighter in color than the rest of that particular band is called the __________. |
H zone |
A. A band B. H zone C. Z disk D. I band |
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The A band contains ________. |
an area of partial overlap between thick and thin filaments |
A, thin filaments only B.an area of partial overlap between thick and thin filaments C. thick filaments only D. M line proteins only |
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After the myosin ATPase hydrolyzes ATP into ADP + Pi, ________. |
the two products stay attached to the myosin head, and the myosin head swivels and binds to a different G-actin molecule, ready for the power stroke |
A. the two products stay attached to the myosin head, and the myosin head swivels and binds to a different G-actin molecule, ready for the power stroke B. the myosin head has nothing bound, ready for the power stroke C. the two products stay attached to the myosin head D. the myosin head swivels and binds to a different G-actin molecule, ready for the power stroke |
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The neurotransmitter that signals the contraction of skeletal muscle fibers is __________. |
acetylcholine |
A. dopamine B. epinephrine C. acetylcholine D. dopamine and epinephrine |
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Muscle fibers can obtain energy from __________ when the oxygen supply for catabolism is too slow to meet the ATP demands of heavy exercise. |
glucose that is then metabolized to lactic acid |
A. glucose that is then metabolized to lactic acid B. glucose C. fatty acids D. proteins |
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Skeletal muscles with the most endurance (resistance to fatigue) are __________ in color. |
red |
A. blue B. yellow C. red D. white |
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Compared to skeletal muscle, smooth muscle ________. |
has longer actin and myosin filaments |
A. has longer actin and myosin filaments B. has more myosin filaments and shorter actin and myosin filaments C. has more myosin filaments D. has more troponin |
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Which of the following is NOT considered one of the three types of muscles? |
Striated muscle |
A. Smooth muscle B. Cardiac muscle C. Striated muscle D. Skeletal muscle |
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The functional unit within a muscle fiber is called a sarcomere. Which of the following does NOT make up part of the sarcomere? |
Myofibril |
A. Actin B. Myofibril C. Tropomyosin D. Myosin |
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Cardiac muscle and smooth muscle are similar in that they both ________. |
are electrically linked, one cell to another |
A. are electrically linked, one cell to another B. have cells with multiple nuclei C. are striated |
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Which of the following statements is true? |
Eccentric contractions perform a lengthening action. |
A. Isotonic contractions create force without movement. B. Eccentric contractions perform a lengthening action. C. During isometric contractions, the muscle shortens. D. Concentric contractions create force and move a load. |
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Which of the following statements comparing smooth muscles to skeletal muscles is FALSE? |
Smooth muscles have more sarcoplasmic reticulum than skeletal muscles. |
A. Smooth muscles have longer actin filaments than skeletal muscles. B. Smooth muscles have more sarcoplasmic reticulum than skeletal muscles. C. Smooth muscles have longer myosin filaments than skeletal muscles. D. Smooth muscle myosin ATPase activity is much slower than skeletal muscle. |
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Which of the following statements is true? |
Smooth muscles have oblique bundles. |
A. Smooth muscles are voluntary. B. Smooth muscles have oblique bundles. C. Skeletal muscles are linked by gap junctions. D. Cardiac muscles require input from motor neurons. |
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Which is the fastest way that a skeletal muscle cell can generate ATP to power muscle contraction? |
High-energy phosphate group of phosphocreatine is transferred to ADP, creating more ATP |
A. Anaerobic glycolysis B. High-energy phosphate group of phosphocreatine is transferred to ADP, creating more ATP C. Oxidation of glucose |
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The generation of a smooth, steady, maximum tension contraction by a muscle fiber, with no evidence of relaxation, due to very rapid stimulation of the muscle fiber is known as ________________. |
complete (or fused) tetanus |
A. incomplete (or unfused) tetanus B. a twitch C. temporal summation D. complete (or fused) tetanus |
