Match Column - I with Column-II and select the correct option from the codes given below.
Column-I (A)Fast muscle fibres (B)Slow muscle fibres (C)Actin (D)Sarcomere
Column-II (i)Myoglobin (ii)Lactic acid (iii)Contractile unit (iv)I-band

Options

A. A-(i),B-(ii),C-(iv),D-(iii)
B. A-(ii),B-(i),C-(iii),D-(iv)
C. A-(ii),B-(i),C-(iv),D-(iii)
D. A-(iii),B-(ii),C-(iv),D-(i)

Answer

To solve the matching question, we will analyze each item in Column-I and find the correct corresponding item in Column-II.

### Step-by-Step Solution:

1. **Fast Muscle Fibres (A)**:
- Fast muscle fibers are known for their ability to generate quick bursts of energy and produce lactic acid during anaerobic respiration.
- **Match**: (A) Fast muscle fibres → (ii) Lactic acid.

2. **Slow Muscle Fibres (B)**:
- Slow muscle fibers are characterized by a higher content of myoglobin, which helps in oxygen storage and utilization.
- **Match**: (B) Slow muscle fibres → (i) Myoglobin.

3. **Actin (C)**:
- Actin is a protein that forms thin filaments in muscle fibers and is a major component of the I-band in the sarcomere.
- **Match**: (C) Actin → (iv) I-band.

4. **Sarcomere (D)**:
- The sarcomere is the basic contractile unit of muscle fibers.
- **Match**: (D) Sarcomere → (iii) Contractile unit.

### Final Matches:
- (A) Fast muscle fibres → (ii) Lactic acid
- (B) Slow muscle fibres → (i) Myoglobin
- (C) Actin → (iv) I-band
- (D) Sarcomere → (iii) Contractile unit

### Correct Option:
Based on the matches, the correct option is:
- A → ii
- B → i
- C → iv
- D → iii

This corresponds to option 3 in the given codes.

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