blood components Flashcards
composition of blood
55% plasma 45% cellular components
composition of plasma
90% water, plasma proteins, digested food, metabolic waste, dissolved mineral salts, hormones
composition of cellular components
rbcs, wbcs, platelets
structure of rbc: biconcave disc shape. func?
incr sa:volume, incr rate of absorption of o2 into cells
structure of rbc: flexible and elastic cell membrane. func?
change shape to squeeze through c
structure of rbc: haemoglobin. func?
allows binding of o2, enables trasnport from lungs to cells
types of wbcs:
lymphocyte, phagocyte
lymphocyte structure:
spherical nucleus, small amt of granular cytoplasm
lymphocyte func:
produce antibodies –> kill bacteria & neutralise toxins
what produces antibodies
lymphocytes
phagocyte structure:
lobed nucleus, granular cytoplasm
phagocyte func:
egulf, ingest digest foreign particles
t/f: lymphocytes digest foreign particles
f
t/f: phagocytes produce antibodies
f
main func of wbcs:
protects body against foreign microbes + toxins
main func of rbcs:
transports o2
phagocytosis:
process of engulfing & ingesting foreign particles
blood clotting process
- damaged tissue & platelets release thrombokinase
- inactive prothrombin is activated into active thrombin with help of thrombokinase & calcium ion
- soluble fibrinogen is activated into insoluble fibrin threads with help of thrombin & vitamin k
adv of blood clotting
prevents person from bleeding to death, prevents foreign substances from entering bloodstream (bacteria etc) causing infection
platelets distribution
sparsely distributed in plasma
platelets are made up of:
cell fragments formed in cytoplasm of certain bone marrow cells
