Question

hematocrit level: the percentage of red blood cells in a blood sample.
72l of blood has a hematocrit level of 20%
the volume of a single red blood cell is approximately 9×10^{-13} liters
approximately how many red blood cells are in a typical adult giraffe body? ×10

Explanation:

Step1: Calculate the volume of red blood cells

The total blood volume is \(72\) liters and the hematocrit level (percentage of red - blood cells) is \(20\%\). So the volume of red blood cells \(V = 72\times0.2=14.4\) liters.

Step2: Calculate the number of red blood cells

The volume of a single red blood cell \(v = 9\times10^{-13}\) liters. Let the number of red blood cells be \(n\). Using the formula \(n=\frac{V}{v}\), we substitute \(V = 14.4\) and \(v = 9\times10^{-13}\). Then \(n=\frac{14.4}{9\times10^{-13}}\).

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Answer:

\(1.6\times10^{13}\)