Q. No.
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All the following are parts of the actin myofilament in a sarcomere except:
1. actin
2. cisternae
3. tropomyosin
4. troponin
An ATPase activity is associated with:
1. G actin molecule
2. head of myosin molecule
3. troponin molecule
4. F actin
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Overlap between actin and myosin myofilaments in a sarcomere is seen in:?
1. A band
2. H zone
3. I band
4. M line
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The drug curare causes:
1. flaccid paralysis.
2. spastic paralysis.
3. smooth muscle degeneration.
4. cardiac failure.
A motor unit is
| 1. | all the muscle fibers innervated by all the motor neurons in a muscle. |
| 2. | all the fibers in one fasciculus. |
| 3. | all the muscle fibers innervated by a single motor neuron in a muscle. |
| 4. | all the motor neurons that innervate one muscle fiber in a muscle. |
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A type of strength training in which the joint angle and muscle length do not change during contraction is termed as:
1. isometric contraction.
2. isotonic contraction.
3. concentric contraction.
4. eccentric contraction.
With respect to slow twitch [Type I] fibers the fast-twitch [Type II] muscle fibers are:
1. More resistant to fatigue.
2. Supplied by more more blood vessels.
3. Having Larger amount of stored glycogen.
4. Having more mitochondria.
In smooth muscle contraction:
1. Calcium ions bind to troponin C.
2. Myosin has no role.
3. Troponin and tropomyosin are moved.
4. Calcium ions bind to calmodulin, which activates an enzyme.
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