BIOL-2230 Lecture Notes - Lecture 4: Red Blood Cell, Myeloblast, Thrombus
9 Feb 2017
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About 5 liters: 8% of total body mass, temperature is higher than normal body temperature. Maintains body ph (very narrow range, 7. 35-7. 45) Carry respiratory gases (oxygen and carbon dioxide) 45% of total blood volume (2 l) Leukocytes: only entire living cell, 5 different types, function primarily in the immune system. Function in blood clotting: leukocytes + platelets = around 1% of total blood volume, all produced in the bone marrow. Plasma: 55% of total blood volume, liquid part of blood, hematocrit determines composition of blood. Also has clotting proteins, wastes, electrolytes, respiratory gases, and nutrients. 5 million red blood cells per milliliter of blood (men have more than women: 4. 7-5. 1, 5. 1-5. 8, women lose some while menstruating. Complex protein (more than one subunit: quaternary structure (four subunits) 250 million molecules per red blood cell. 1 red blood cell can hold a billion oxygen molecules. 4 polypeptide chains: 2 alphas, 2 betas.
