Diagrams from Wednesday

1. Blood vessel is punctured. 2. Platelets congregate and form a plug. Prothrombin activator 3. Platelets and damaged tissue cells release prothrombin activator, which initiates a cascade of enzymatic reactions. Ca2+ Prothrombin Thrombin Ca2+ Fibrinogen Fibrin threads 4. Fibrin threads form and trap red blood cells.

Arterial end Blood pressure is higher than osmotic pressure. Net pressure out. Venous end Osmotic pressure is higher than blood pressure. Net pressure in. from heart to heart Tissue fluid amino acids water water oxygen carbon dioxide glucose wastes osmotic pressure arteriole salt plasma protein blood pressure venule