Define a cardiac cycle and cardiac output.

Explanation

### Step-by-Step Text Solution

**Step 1: Define Cardiac Cycle**
The cardiac cycle refers to the sequence of events that occur in the heart during one complete heartbeat. It includes both the contraction (systole) and relaxation (diastole) phases of the heart. During systole, the heart muscles contract to pump blood out of the heart, while during diastole, the heart muscles relax, allowing the chambers to fill with blood. This cycle ensures that blood is continuously circulated throughout the body.

**Step 2: Define Cardiac Output**
Cardiac output is the volume of blood that the heart pumps per minute. It is a crucial measure of the heart's efficiency and overall health. Cardiac output can be calculated using the formula:
\[ \text{Cardiac Output} = \text{Heart Rate} \times \text{Stroke Volume} \]
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