Filling of ventricles with the blood takes place during:

Options

A. Ventricular diastole only
B. Atrial systole only
C. Ventricular and atrial systole
D. Joint diastole and atrial systole

Answer

To determine when the filling of the ventricles with blood occurs, we need to analyze the phases of the cardiac cycle. Here’s a step-by-step breakdown of the options provided:

### Step 1: Understand the Phases of the Cardiac Cycle
The cardiac cycle consists of several phases, including diastole and systole. Diastole is when the heart muscle relaxes, and systole is when the heart muscle contracts.

### Step 2: Analyze Each Option
1. **Ventricular Diastole**: This phase involves the relaxation of the ventricles. During this time, the ventricles are filling with blood from the atria. However, this phase is not the primary phase for filling.

2. **Arterial Systole**: This phase refers to the contraction of the atria (auricles), which pushes blood into the ventricles. This is a key phase for the filling of the ventricles.

3. **Ventricular and Arterial Systole**: In this phase, both the ventricles and atria are contracting, which means the ventricles are not filling with blood.

4. **Joint Diastole and Arterial Systole**: Joint diastole is a phase where both the atria and ventricles are relaxed, allowing for blood to fill the heart chambers. During this time, the atria contract (arterial systole), pushing blood into the ventricles.

### Step 3: Identify the Correct Answer
The correct answer is **Joint Diastole and Arterial Systole**. This is the phase where the atria contract and fill the ventricles with blood.

### Final Answer
The filling of the ventricles with blood takes place during **Arterial Systole**.

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