Q. No.A in dark band of muscle fibril stands for
(1) Anisotropic
(2) Animated
(3) Ancient
(4) Annulated
I in light band of muscle fibril stands for
(1) Isotropic
(2) Isolated
(3) Innervated
(4) Inosonic
Sarcolemma is the covering of
(a) Nerve fibres
(b) Muscle fibres
(c) Bone marrow
(d) Liver, kidney and stomach
The light band has….. and is called….
(1) Actin, A band
(2) Actin,. I band
(3) Myosin, M band
(4) Myosin, A band
Sarcomere is
(1) Functional unit of contraction
(2) Portion between two successive Z lines
(3) A part of myofibrils
(4) All of these
| Statement I: | Each actin (thin) filament is made of two ‘F’ (filamentous) actins helically wound to each other. |
| Statement II: | Each ‘F’ actin is a polymer of monomeric ‘G’ (Globular) actins. |
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
Which of the following is not a correct match?
(1) Light band - I band
(2) Dark band- H band
(3) Light band- Actin
(4) Dark band- Myosin
Anaerobic work becomes painful due to accumulation of
1. Ca2+ ions
2. Myosin
3. Lactic acid
4. Creatine phosphate
| 1. | an example of RER and secretes a large number of proteins. |
| 2. | the store house of calcium ions. |
| 3. | not bound by a membrane. |
| 4. | organised into light and dark bands giving the muscle fibres a striated appearance. |
Reason (R): The light band on myofibril is isotropic band.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false
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