Pulse is a direct measure of

Options

A. blood pressure
B. stroke volume
C. cardiac output
D. heart rate

Answer

To solve the question "Pulse is a direct measure of," we will analyze the options provided and determine which one is correct based on our understanding of pulse and heart function.

### Step-by-Step Solution:

1. **Understanding Pulse**:
- Pulse is the rhythmic expansion and contraction of arteries as blood is pumped through them by the heart. It reflects the heart's activity.

2. **Analyzing the Options**:
- **Option 1: Blood Pressure**:
- Blood pressure measures the force of blood against the walls of arteries, but it is not directly measured by pulse.
- **Option 2: Stroke Volume**:
- Stroke volume refers to the amount of blood pumped by the heart with each beat. While it contributes to pulse, it is not what pulse directly measures.
- **Option 3: Cardiac Output**:
- Cardiac output is the total volume of blood the heart pumps per minute. It is a function of heart rate and stroke volume but is not directly measured by pulse.
- **Option 4: Heart Rate**:
- Heart rate is the number of times the heart beats in one minute. Since pulse is the result of the heart's contractions, it directly correlates with heart rate.

3. **Conclusion**:
- Based on the analysis, pulse is a direct measure of heart rate. Therefore, the correct answer is **heart rate**.

### Final Answer:
Pulse is a direct measure of **heart rate**.