In human beings, how much blood is pumped to brain per minute?

Options

A. 0.5 litre
B. 1.2 litre
C. 0.75 litre
D. 1.5 litre

Answer

To determine how much blood is pumped to the brain per minute in human beings, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Cardiac Output**: Cardiac output is the volume of blood the heart pumps per minute. It is calculated as the product of stroke volume (the amount of blood pumped by the heart with each beat) and heart rate (the number of heartbeats per minute).

2. **Determine Total Cardiac Output**: In a healthy adult, the average cardiac output is approximately 5,000 ml (or 5 liters) per minute.

3. **Calculate the Percentage of Cardiac Output to the Brain**: The brain receives about 15% of the total cardiac output.

4. **Calculate the Volume of Blood to the Brain**: To find out how much blood is pumped to the brain, we calculate 15% of the total cardiac output:
\[ \text{Blood to brain} = 15\% \text{ of } 5000 \text{ ml} \]
\[ = 0.15 \times 5000 \text{ ml} = 750 \text{ ml} \]

5. **Convert to Liters**: Since 750 ml is equivalent to 0.75 liters, we conclude that the amount of blood pumped to the brain per minute is 0.75 liters.

6. **Select the Correct Option**: Among the provided options, the correct answer is option C, which states 0.75 liters.

### Final Answer:
The amount of blood pumped to the brain per minute in human beings is **0.75 liters**.

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