BIOL 2P97 Lecture Notes - Lecture 13: Vasoconstriction, Trachea, Collagen
12 Jan 2016
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Blood is composed of 3l plasma + 2l cellular elements. White blood cells (wbcs) immune function (lymphocytes, monocytes, neutrophils, Basophils) (if its not ben (the last 3), then its not a granulocyte) Blood cells originate from a specific precursor cell: pluripotent (can turn into any blood cell/any cellular component in the blood) hematopoietic stem cell. These narrow cells are found in the bone marrow. They can turn into many types of cells end up going into the bloodstream. The fate narrows as the pluripotent stem cell specializes. Specific types of blood cells are released into the blood. Thrombopoietin -(clot- platelets ) released by liver; helps ensure that platelets are made. Lack a nucleus; live for 120 days (old rbcs are destroyed in the spleen) Boconcave shape increases sa; allows shape to modify. Modification of shape of rbcs fig c) and d) Hypertonic solution: fluid leaves rbc and it shrinks. Hypotonic solution: fluid enters the rbc and it swells.
