An adult human body contains about 5 liters of blood. How many platelets are in an adult human body? Write your answer in standard form.
Question
An adult human body contains about 5 liters of blood. How many platelets are in an adult human body? Write your answer in standard form.
Solution
The number of platelets in the human body can vary, but a healthy individual typically has between 150,000 to 450,000 platelets per microliter of blood.
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First, let's take the average of the range, which is (150,000 + 450,000)/2 = 300,000 platelets per microliter.
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There are 1,000,000 microliters in a liter, so in 1 liter of blood, there would be approximately 300,000,000,000 (300 billion) platelets.
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Since an adult human body contains about 5 liters of blood, we multiply the number of platelets in 1 liter by 5.
So, there are approximately 1,500,000,000,000 (1.5 trillion) platelets in an adult human body. This is written in standard form as 1.5 x 10^12.
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