Match the columns : (a) Atrial systole (Column I) (i) 0.7 seconds (Column II) , (b) Joint diastole (Column I) (ii) 0.3 seconds (Columnn II) (c) Ventricular systole (Column I) (iii) 0.1 second (Column II) , (d) Atrial diastole (Column I) (iv) 0.4 seconds (Column II)

Options

A. a(iii) , b(iv), c(ii), d(i)
B. a(iv), b(iii), c(ii), d(i)
C. a(iii), b(iv), c(i), d(ii)
D. a(i), b(ii), c (iii), d(iv)

Answer

To solve the question of matching the columns regarding the phases of the cardiac cycle with their respective durations, we will follow these steps:

### Step 1: Identify the duration of each phase
1. **Atrial Systole**: This is the contraction of the atria and lasts for **0.1 seconds**.
2. **Joint Diastole**: This phase occurs when both the atria and ventricles are in diastole (relaxation) and lasts for **0.4 seconds**.
3. **Ventricular Systole**: This is the contraction of the ventricles and lasts for **0.3 seconds**.
4. **Atrial Diastole**: This phase is when the atria are relaxed and lasts for **0.7 seconds**.

### Step 2: Match each phase with its duration
- (a) **Atrial Systole** → (iii) **0.1 seconds**
- (b) **Joint Diastole** → (iv) **0.4 seconds**
- (c) **Ventricular Systole** → (ii) **0.3 seconds**
- (d) **Atrial Diastole** → (i) **0.7 seconds**

### Step 3: Write the final matches
1. Atrial Systole → 0.1 seconds (iii)
2. Joint Diastole → 0.4 seconds (iv)
3. Ventricular Systole → 0.3 seconds (ii)
4. Atrial Diastole → 0.7 seconds (i)

### Final Matching:
- (a) Atrial Systole → (iii) 0.1 seconds
- (b) Joint Diastole → (iv) 0.4 seconds
- (c) Ventricular Systole → (ii) 0.3 seconds
- (d) Atrial Diastole → (i) 0.7 seconds