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CH 21 - CH21:Blood o...

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CH 21: Blood Blood is a type of connective tissue o Plasma: no cells. 92% water and 7% “plasma proteins” Most plasmas proteins are produced in the liver. *don’t need to know the specific types of  plasma proteins in this class* o Cells (“formed elements”) of blood Are derived from cells *know the greek names for the test. o Erythrocytes (red blood cells) (ertythro = red ) Flexible Hemoglobin (hgb) is a type of molecule that is contained within erythrocytes. One hgb molecule includes 4 globin (protein) chains and 4 heme groups (iron ion is  in the center of heme). The heme group can hold one oxygen molecule. o Circulation  Pulmonary circuit – from heart to lungs and back to heart. Systemic circuit – from heart to all other organs and back to heart (includes brain) In lungs: Hemoglobin absorbs oxygen (becomes “oxygenated”) through diffusion Oxyhemoglobin is bright red. In organs other than lungs  Blood diffuses into cells and at the venous end of the capillary the blood pressure  drops. Deoxygenated hemoglobin has 3 oxygen molecules attached to it. o Function of stem cells in  red   bone   marrow : One daughter cell becomes a blood cell The other daughter cell remains a stem cell and can repeat the process of splitting. Myeloid (“myelo” – bone marrow, it can also mean spinalchord however) stem cells give  rise to all formed elements except lymphocytes.  All myeloid combined can produce approx 3 million new blood cells per second. o Erythrocytes are formed in redbone marrow and circulate in bloodstream for 120 days, after  about 120 days erythrocytes become fragile and tend to rupture.
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