Define cardiac cycle and cardiac output.

Explanation

### Step-by-Step Solution:

1. **Define the Cardiac Cycle:**
- The cardiac cycle refers to the sequence of events that occur in the heart from the beginning of one heartbeat to the beginning of the next. It encompasses all the mechanical and electrical activities of the heart during this period.

2. **Phases of the Cardiac Cycle:**
- The cardiac cycle can be divided into three main phases:
- **Ventricular Diastole:** This phase involves the relaxation of the heart chambers (atria and ventricles) and their filling with blood. During this time, the atria fill with blood returning from the body and lungs.
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