Question

Match the following and mark the correct option.

Column I	Column II
A. Fast muscle fibres	i. Myoglobin
B. Slow muscle fibres	ii. Lactic acid
C. Actin filament	iii. Contractile unit
D. Sarcomere	iv. I-band

• A. A-i, B-ii, C-iv, D-iii
• B. A-ii, B-i, C-iii, D-iv
• C. A-iii, B-ii, C-iv, D-i
• D. A-ii, B-i, C-iv, D-iii

Answer 1

The correct option is A A-i, B-ii, C-iv, D-iii

a) Fast muscle fibres - They have a large amount of myoglobin which is resistant to fatigue.

b) Slow muscles fibres - These type of fibres show a slow 'tunic' contraction characteristic of postural muscles. The lactic acid is produced during muscle contraction.

c) Actin filament - The light bands present in myofibrils contain actin and is called I-band or isotropic band.

d) Sarcomere - It is the contractile unit of muscle fibres.

So, the correct answer is 'A-i, B-ii, C-iv, D-iii'.