BIOB33H3 Lecture Notes - Lecture 10: Semicircular Canals, Extracellular Fluid, Purkinje Fibers
25 Mar 2016
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Transports substances like nutrients, oxygen, co2, hormones ions, metabolic waste (to kidneys), leukocytes to ight infecion etc. Formed elements make up other 45%, consising of: platelets (0. 1%, involved in cloing, erythrocytes (rbcs, leukocytes (wbcs), of which 50-70% neutrophils, 20-30% lymphocytes and some. Around 7. 7 microns in diameter, lacking organelles and nucleus (anucleated). Also lack mitochondria so that transported oxygen isn"t. When an erythrocyte develops, it loses organelles and by maturity is mainly a cell membrane w/ water (2/3) and protein (1/3, of while 95% hemoglobin). 4 protein subunits, with each containing a heme molecule (a porphyrin which is a ring-shaped organic compound) where the iron binds to oxygen and the polypepide binds co2 (they don"t compete for binding sites). Rbc are destroyed in the spleen by macrophages, with heme being transported to liver by transferrin and iron stored by ferriin (proteins). Non-iron part eventually becomes bilirubin which makes your poop brown.
