components of blood: plasma and platelets Flashcards
1
Q
plasma
A
fluid portion of blood, 55% of blood
90% water, 10% materials (nutrients, waste)
2
Q
components of plasma
A
albumin: osmotic pressure
globulin: anitbodies
fibrinogen: blood clotting
3
Q
platelets
A
blood clotting, less than 1% of blood
colourless, enucleated
4
Q
how do platelets clot blood
A
broken blood vessel releases chemicals that attracts platelets to injury site. platelets rupture releasing chemicals to produce thromboplastin. if calcium is present, thromoplastin+prothrombin=thrombin. thrombin+fibrinogen=fibrin. fibrin forms a mesh over injury site that prevents blood loss and solidifies to form a clot