Blood and Vessels

gezidalo's version from 2017-05-05 02:59


Question Answer
the fluid component of bloodplasma
92% water, with dissolved electrolytes and organic components, 7% proteinsplasma
important for osmotic balance, pH balancealbumins
antibodes, transport globulinsglobulins
dissolved precursor of fibrin, which will form blood clotsfibrinogen
Around 1/3 of all human body cells, Continuously made and destroyed; 120-day lifespanred blood cells (erythrocytes)
Percentage of whole blood composed of RBCs is calledhematocrit
Major purpose – oxygen transportred blood cells (erythrocytes)
s have immune functionsWhite blood cells or leukocytes
main phagocytic WBCNeutrophil
releases histamineBasophil
releases antihistamines, targets parasitic wormsEosinophil
respond to specific stimuli, make antibodiesLymphocyte
large phagocytic WBCMonocyte
the stoppage of bleedingHemostasis
Endothelial cells contract, exposing basement membrane to blood. – Local contraction of smooth muscle in blood vessel wall (vascular spasm)Vascular phase
Platelets stick to exposed collagen, basement membrane, endothelium, and each other. Platelets release chemicals to attract more platelets, cause vasoconstriction, and set off coagulationPlatelet phase
involves building a mesh of fibrinCoagulation (clotting)
damage outside a vesselextrinsic pathway
damaged vesselintrinsic pathway
Factor X combined with other factors > Prothrombinase converts Prothrombin to Thrombin> Thrombin converts fibrinogen to Fibrin > Activates Factor XIII (clot stabilizer), Activates previous factors to continue clot formationCoagulation Phase
feed through capillary beds into venulesArterioles
are the only sites where exchange of gases, nutrients, wastes, and hormones can occurCapillaries
innermost layer, slick simple squamous endothelium. underlying C.T. with elastic fibersTunica intima
middle layer, lots of smooth muscle to control diameterTunica media
outer layer, Connective tissue sheathTunica externa