Question

Match the following columns.

$\begin{array}{cccc}& \text{Column I}& & \text{Column II}\\ \text{A}& \text{Fast muscle fibres}& 1& \text{Myoglobin}\\ \text{B}& \text{Slow muscle fibres}& 2& \text{Lactic acid}\\ \text{C}& \text{Actin filament}& 3& \text{Contractile unit}\\ \text{D}& \text{Sarcomere}& 4& \text{I - band}\end{array}$

• A. A-1, B-2, C-4, D-3
• B. A-2, B-1, C-3, D-4
• C. A-2, B-1, C-4, D-3
• D. A-3, B-2, C-4, D-1

Answer 1

The correct option is C A-2, B-1, C-4, D-3

Fast muscles fibres contract spontaneously and reach anaerobic conditions in shorter time,and produce more lactic acid.

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.

I band of myofibril has actin filaments only.

Sarcomere is the contractile unit of skeletal muscle.