Q. No.During relaxation in smooth muscle:
1. calcium is removed from troponin.
2. bind to calmodulin.
3. myosin phosphatase removes phosphate from myosin.
4. Calcium is released from the sarcoplasmic reticulum.
Cylindrical, branched muscle cells that are arranged into functional syncytium are:
1. cardiac muscles.
2. skeletal muscles.
3. single unit smooth muscles.
4. multi unit smooth muscles.
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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.
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