Platelets - alpha and beta globulins(proteins that...

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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 blood and tissues. Other proteins include 
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Unformatted text preview: 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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