NH107 Lecture Notes - Lecture 1: Sympathetic Nervous System, Thrombin, Vasoconstriction
Document Summary
Cardiovascular system: heart, blood vessels, blood, lymph system. The only fluid tissue in the human body. Classified as a connective tissue: living cells = formed elements. 45% cells: 99% rbcs, < 1% wbcs and platelets. Antibodies help protect the body from antigens. Clotting proteins help to stem blood loss when a blood vessel is injured. Capillary colloid osmotic pressure reduces fluid leakage out of capillaries. Q-why doesn"t water flow out of the blood capillaries. Edema- deficiency of plasma proteins (pregnancy- ankle edema) Transport, substrates for formation of other substances immunity [antibodies] Cellular components of blood: erythrocytes = red blood cells, leukocytes = white blood cells, platelets/thrombocytes = cell fragments. The main function is to carry oxygen: anatomy of circulating erythrocytes. Essentially bags of hemoglobin-heme-iron(4 heme, 4 iron molecules) Fixed life span of approx 120 days: outnumber white blood cells 1000:1.
