Multiple Choice
Approximately what percentage of whole blood is water?
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17. The Blood
Introduction To Blood
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In a healthy average adult human, approximately how many liters of blood are contained in the body?
A
About 1 liter
B
About 20 liters
C
About 5 liters
D
About 10 liters
Verified step by step guidance1
Understand that the total blood volume in an average healthy adult human is typically measured in liters and varies based on factors like body size and sex.
Recall that the average blood volume is roughly proportional to body weight, often estimated as about 7-8% of total body weight.
For an average adult weighing around 70 kg, calculate the approximate blood volume using the formula: \(\text{Blood Volume} = 0.07 \times \text{Body Weight (kg)}\).
Perform the multiplication to find the blood volume in liters, keeping in mind that 1 kg of body weight roughly corresponds to 1 liter of blood volume percentage-wise.
Compare the calculated value to the given options to identify the closest estimate, which is about 5 liters for an average adult human.
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