Q. No.There are 8 and 7 bones respectively in:
1.
tarsal [ankle] and carpal [wrist]
2.
carpal[wrist] and tarsal[ankle]
3.
neurocranium and facial skeleton
4.
facial skeleton and neurocranium
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Identify the correct characteristic of a skeletal muscle:
1. spindle-shaped cells
2. involuntary control
3. true syncytium
4. non striated
Arrange the given structures in relation to a skeletal muscle in descending order of their size:
a. whole muscle
b. muscle fiber (cell)
c. myofilament
d. myofibril
e. muscle fasciculus
| 1. | a, b, e, c, d | 2. | a, b, e, d, c |
| 3. | a, e, b, c, d | 4. | a, e, b, d, c |
The correct statement regarding myofibril would be:
| 1. | It is the name for a muscle cell. |
| 2. | It contains sarcoplasmic reticulum. |
| 3. | It is made up of many sarcomeres. |
| 4. | It is a bundle of muscle cells. |
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Myosin myofilaments are
1. made up of thick and thin myofilaments.
2. found only in the H zone.
3. not seen in the H zone.
4. attached to filaments that form the M line.
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Identify the correct statement:
1. Tropomyosin is found in two forms – monomeric G and polymeric F.
2. The head of the myosin molecule binds to an active site on G actin.
3. ATPase is present in troponin A.
4. Actin molecules do not move during muscle contraction.
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The extensions of the cell membrane that penetrate into the centre of skeletal and cardiac muscle cells are called as:
| 1. | transverse tubule system | 2. | sarcoplasmic reticulum |
| 3. | myofibrils | 4. | terminal cisternae |
Arrange the following events in correct chronological order:
| a: | acetylcholine hydrolyses into acetate and choline |
| b: | acetylcholine diffuses across the synaptic cleft |
| c: | Impulse reaches the terminal endings of the motor neuron |
| d: | acetylcholine binds to its receptor on motor end plate |
| e: | sarcolemma gets depolarized |
| 1. | b, c, d, a, e | 2. | c, b, d, e, a |
| 3. | c, d, b, a, e | 4. | d, e, b, a, c |
Acetylcholinesterase:
1. helps in binding of acetylcholine to its receptors.
2. catalyzes the synthesis of acetylcholine from acetate and choline.
3. stimulates receptors within the postsynaptic membrane.
4. breaks down acetylcholine.
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