A cardiac cycle does involve

Options

A. ventricular systole-joint diastole -auricular systole
B. auricular systole-ventricular systole-joint diastole
C. auricular systole-joint diastole-ventricular systole
D. joint diastole-ventricular systole-auricular systole

Answer

To solve the question regarding what a cardiac cycle involves, we need to understand the phases of the cardiac cycle and the order in which they occur. Here’s a step-by-step breakdown:

### Step 1: Understand the Phases of the Cardiac Cycle
The cardiac cycle consists of several phases that occur in a specific order:
- **Atrial Systole**: The atria contract, pushing blood into the ventricles.
- **Ventricular Systole**: The ventricles contract, pumping blood into the aorta and pulmonary artery.
- **Joint Diastole**: Both the atria and ventricles relax, allowing the heart to fill with blood.

### Step 2: Analyze the Given Options
Now, let's evaluate the provided options:
1. **Ventricular Systole, Joint Diastole, Auricular Systole**: This order is incorrect because atrial systole occurs before ventricular systole.
2. **Auricular Systole, Ventricular Systole, Joint Diastole**: This order is correct. It follows the sequence of the cardiac cycle.
3. **Auricular Systole, Joint Diastole, Ventricular Systole**: This order is incorrect because ventricular systole should follow atrial systole, not joint diastole.

### Step 3: Conclusion
Based on the analysis, the correct answer is the second option: **Auricular Systole, Ventricular Systole, and Joint Diastole**.

### Summary of the Cardiac Cycle
- **Atrial Systole**: Blood is pushed into the ventricles.
- **Ventricular Systole**: Blood is pumped into the arteries.
- **Joint Diastole**: Heart chambers relax and fill with blood.