Hematocrit is the percentage of red blood cells in the blood. In adult humans, hematocrit is roughly 40-45%, but it can be much higher or lower in other animals. Consider the Weddell seal, a mammal that can dive and hold its breath underwater for upwards of 80 minutes. What is the hematocrit level of a Weddell seal, and why?

Question

Quizplus · Accepted Answer

Weddell seals have a higher hematocrit level than adult humans because their bodies need to store more oxygen for their long dives underwater. A higher concentration of red blood cells allows for greater oxygen storage, enabling these seals to hold their breath for extended periods.

Hematocrit Is the Percentage of Red Blood Cells in the Blood