A person has cardiac output 5600ml / minute and stroke volume 70 ml . What would be the number of heartbeat in 2 minutes in this person

Options

A. 80 heart beats
B. 70 heart beats
C. 140 heart beats
D. 160 heart beats

Answer

To solve the problem step by step, we need to calculate the number of heartbeats in 2 minutes given the cardiac output and stroke volume.

### Step 1: Understand the relationship between cardiac output, stroke volume, and heart rate.
Cardiac output (CO) is defined as the amount of blood the heart pumps in one minute. It can be calculated using the formula:
\[ \text{Cardiac Output (CO)} = \text{Stroke Volume (SV)} \times \text{Heart Rate (HR)} \]

### Step 2: Identify the given values.
From the question, we have:
- Cardiac Output (CO) = 5600 mL/min
- Stroke Volume (SV) = 70 mL

### Step 3: Rearrange the formula to find the heart rate (HR).
We can rearrange the formula to solve for heart rate:
\[ \text{Heart Rate (HR)} = \frac{\text{Cardiac Output (CO)}}{\text{Stroke Volume (SV)}} \]

### Step 4: Substitute the known values into the formula.
Now, substituting the known values into the formula:
\[ \text{HR} = \frac{5600 \, \text{mL/min}}{70 \, \text{mL}} \]

### Step 5: Perform the calculation.
Calculating the heart rate:
\[ \text{HR} = \frac{5600}{70} = 80 \, \text{beats/min} \]

### Step 6: Calculate the number of heartbeats in 2 minutes.
To find the total number of heartbeats in 2 minutes, we multiply the heart rate by 2:
\[ \text{Total Heartbeats in 2 minutes} = \text{HR} \times 2 \]
\[ \text{Total Heartbeats in 2 minutes} = 80 \, \text{beats/min} \times 2 \, \text{min} = 160 \, \text{beats} \]

### Conclusion:
The number of heartbeats in 2 minutes for this person is **160 beats**.