State the amount of blood in cardiac output at rest and exercise.

Explanation

To answer the question about the amount of blood in cardiac output at rest and during exercise, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding Cardiac Output**:
- Cardiac Output (CO) is the volume of blood the heart pumps per minute. It is calculated using the formula:
\[
\text{Cardiac Output} = \text{Stroke Volume} \times \text{Heart Rate}
...