components of blood: plasma and platelets

Question 1

plasma

Answer 1

fluid portion of blood, 55% of blood

90% water, 10% materials (nutrients, waste)

Question 2

components of plasma

Answer 2

albumin: osmotic pressure
globulin: anitbodies
fibrinogen: blood clotting

Question 3

platelets

Answer 3

blood clotting, less than 1% of blood

colourless, enucleated

Question 4

how do platelets clot blood

Answer 4

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