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Each myofibril has a diameter of (a) 1 ...

Each myofibril has a diameter of
(a) 1 to 2 `mu`m
(b) `0.1` to `0.2 mu m`
(c) `.001` to `.002 mu`m
(d) None of the above

A

1 to 2 `mu`m

B

`0.1` to `0.2 mu m`

C

`.001` to `.002 mu`m

D

None of the above.

Text Solution

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The correct Answer is:
To solve the question regarding the diameter of each myofibril, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Definition of Myofibril**: - A myofibril is a long cylindrical organelle found in muscle cells. It is essential for muscle contraction and is composed of two transverse filament systems. 2. **Identify the Characteristics of Myofibrils**: - Myofibrils are formed by the arrangement of myofilaments (actin and myosin) and extend over the entire length of the muscle fiber. 3. **Determine the Diameter of Myofibrils**: - Based on biological studies, the diameter of a myofibril is typically reported to be between 1 to 2 micrometers (µm). 4. **Evaluate the Options Provided**: - (a) 1 to 2 µm - This matches the known diameter of myofibrils. - (b) 0.1 to 0.2 µm - This is too small for myofibrils. - (c) 0.001 to 0.002 µm - This is significantly smaller than the actual diameter. - (d) None of the above - This is incorrect since option (a) is valid. 5. **Select the Correct Answer**: - The correct answer is (a) 1 to 2 µm. ### Final Answer: (a) 1 to 2 µm ---
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