PHED-2507EL Lecture 2: Chapter 17 Notes
28 Feb 2019
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Delivering o2 and nutrients to body cells. Transporting metabolic wastes to lungs and kidneys for elimination. Transporting hormones from endocrine organs to target organs. Maintaining body temperature by absorbing and distributing heat. Maintaining normal ph using buffers; alkaline reserve of bicarbonate ions. Maintaining adequate fluid volume in circulatory system. Preventing blood loss: plasma proteins and platelets in blood initiate clot formation. Preventing infection: agents of immunity are carried in blood, antibodies, white blood cells. Blood is composed of plasma and formed elements. Cells are living blood cells called formed elements: cells are suspended in plasma, formed elements, erythrocytes (rbcs) Hematocrit: percent of blood volume that is rbcs: normal values, males: 47% +/- 5, females: 42% +/- 5% Thin, whitish layer between rbcs and plasma layer. Blood is a sticky, opaque fluid with metallic taste. Colour varies with o2 content: high o2 levels show a scarlet red, low o2 levels show a dark red. Average volume: males: 5-6 l, females: 4-5l.
