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Question

Match the following columns.

    Column I    Column IIA.   Fast muscle fibres1.   MyoglobinB.   Slow muscle fibres2.   Lactic acidC.   Actin filament3.   Contractile unitD.   Sarcomere4.   Iband

Codes

        A          B            C           D

(a)    1          2            4            3

(b)    2          1            3            4

(c)    2          1             4            3  

(d)    3          2             4            1


Solution

Option (c)

1. Fast muscle fibres   contract spontaneously and reach anaerobic conditions in shorter time, so as to accumulate lactic acid faster in the muscles.

2. Slow  muscle fibres    have better ability to endure, as they are resistant to fatigue and contract slowly, it is because , of accumulation, of large amount , of myoglobin in them.

3. Actin filament    form the isometric band in the muscle fibre because it is the only this actin protein which is present in that region.

4. Sarcomere     is the contractile unit of skeletal muscle.


Biology
NCERT Exemplar
Standard XI

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