Blood transports oxygen, nutrients, carbon dioxide and metabolic waste products, supports immune defense and coagulation, regulates body temperature around 37Ā°C, and buffers pH fluctuations within 7.35ā7.45.
Blood consists of 40ā45% blood cells and 55ā60% plasma; hematocrit is the volume fraction of blood cells in total blood volume and averages 46% in men and 42% in women.
1. A person's blood helps maintain a stable internal environment; which set of functions best describes how it does so?
2. A laboratory measures the volume fraction of blood cells in a blood sample; what is this measurement called?
3. Which description most accurately represents the approximate composition of blood plasma?
What functions does blood perform in transport, defense, and coagulation?
It transports oxygen, nutrients, carbon dioxide, and metabolic waste, and supports immune defense and coagulation.
What body temperature does blood help regulate?
Around 37Ā°C.
What pH range does blood buffer?
7.35ā7.45.
What proportions of blood are cells and plasma?
Blood is 40ā45% cells and 55ā60% plasma.
What does hematocrit measure, and what are its average values in men and women?
It measures the blood-cell volume fraction; averages are 46% in men and 42% in women.
What are the approximate proportions of water, proteins, and other substances in plasma?
About 90% water, 8% proteins, and 2% other substances.
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