Platelets - blood and tissues Other proteins include alpha...

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Platelets Platelets  (  thrombocytes ) are fragments of huge cells called megakaryocytes.  Megakaryocytes fragment as they pass from the bone marrow into the bloodstream.  Platelets lack a nucleus and consist of cytoplasm (with few organelles) surrounded by a  plasma membrane. Platelets adhere to damaged blood vessel walls and release  enzymes that activate  hemostasis,  the stoppage of bleeding. Plasma Plasma is the straw-colored, liquid portion of the blood. It consists of the following: Water (90 percent). Proteins (8 percent). Albumin, the most common protein, is  produced by the liver and serves to preserve osmotic pressure between 
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Unformatted text preview: blood and tissues. Other proteins include alpha and beta globulins (proteins that transport lipids and metal ions), gamma globulins (antibodies), fibrinogen and prothrombin (clotting proteins), and hormones. • Waste products (urea, uric acid, creatinine, bilirubin, and others). • Nutrients (absorbed from the digestive tract). • Electrolytes (various ions such as sodium, calcium, chloride, and bicarbonate). • Respiratory gases (O 2 and CO 2 ). Serum is the liquid material remaining after blood-clotting proteins have been removed from plasma as a result of clotting....
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This note was uploaded on 12/04/2011 for the course ANTHRO 2000 taught by Professor Monicaoyola during the Fall '10 term at Broward College.

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Platelets - blood and tissues Other proteins include alpha...

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