BILD 2 Lecture 3: Gas Exchange
8 Mar 2018
School
Department
Course
Professor
Document Summary
Centrifuged blood reveals plasma (clear) and cells (red) Same as interstitial fluid; important for nerve function. 7% proteins: immunoglobulins (antibodies), fibrinogens (clotting factors), albumin (ph balance, osmotic balance) White blood cells (leukocytes) fight infections, produce antibodies. Plaques of lipids on inner walls of arteries; causes hypertension= high blood pressure. Hardened plaques; reduced diameter; blood clot trapped more easily. Ldl: low density lipoproteins deposit cholesterol in plaques. Hdl: high density lipoproteins reduce deposition of cholesterol. Ldl proteins carry cholesterol lipids from the liver to cells and tissues in the body where cholesterol is needed. However, ldls also deposit cholesterol in the artery lining causing atherosclerosis. Hdl proteins carry cholesterol from body tissues and artery lining to the liver. Smoking can always cause damage to the artery lining. Multicellular animals take up o2 by respiratory surfaces. Atmospheric pressure at sea level is equal to a column of 760 mmhg. The partial pressure of oxygen (po2) in such conditions is 160 mmhg.
