BIOL 2021 Lecture Notes - Lecture 12: Great Arteries, Posterior Interventricular Sulcus, Tricuspid Valve

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Blood circulation powered by the pumping action of the heart. Functions of blood: transportation carries respiratory gases, nutrients and hormones, regulation helps regulate body temperature, protection against disease and excessive blood loss. Blood volume makes up about 8% of total body weight: males have 5-6 liters of blood and females have 4-5 liters of blood. Composition of blood: contains cellular and liquid components, is a specialized connective tissue. Blood cells formed elements, about 45%, mostly rbcs, some white blood cells and platelets. Plasma fluid portion and fibrinogen, about 55%, mostly water. Blood plasma straw-colored, sticky fluid portion of blood: approximately 90% water, also contains: Nutrients sugars, amino acids, lipids, wastes, and proteins. Ratio of # of mature vs. immature rbcs in circulation, if not relatively equal it means mature cells have been introduced via transfusion. Molecule contained in blood bags that would only be present in a person who had undergone a blood transfusion.

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