Exam 3 Flashcards
functions of blood
transportation
regulation
defense
blood transportation
oxygen and carbon dioxide
nutrients, hormones, waste products
blood regulation
absorbs heat and distributes throughout body
regulates body pH and fluid levels
blood defense
protect from infection
transport infection fighting antibodies
forms blood clots
blood composition
55% plasma
Buffy coat: leukocytes and platelets 1%
erythrocytes: 44 % (red)
plasma
92% water
7% protein
other solutes
proteins in plasma
albumins
globulins
fibrinogen
regulatory proteins
other solutes in plasma
electrolytes
nutrients
respiratory gases
waste products
erythrocytes (RBC’s) structure
small, biconcave disc
- allow gas to be loaded/unloaded
erythrocyte characteristics
filled with hemoglobin (transport o2 + CO2)
no nucleus or organelles
single file as pass through vessels
erythrocyte life cycle
form in red bone marrow
circulate in blood stream (120 days)
aged phagocytized in liver, spleen, bone marrow
old broken to make new
heme converted to bilirubin and secreted in bile by liver
polycythemia
too many erythrocytes in the blood
increase viscosity of blood, strain on heart
anemia
low levels of erythrocytes or hemoglobin
low blood O2 levels
leukocyte (WBC) structure
larger than erythrocytes
leukocyte characteristics
nucleus and organelles
initiate immune response and defend against pathogens
diapedesis and chemotaxis
diapedesis
WBC leave blood stream and enter tissue
chemotaxis
WBC attracted to site of infection by damaged cells, dead cells, or invading pathogens
types of leukocytes
granulocyte and agranulocyte
granulocytes
neutrophil
eosinophil
basophil
neutrophil
phagocytizes pathogens
granulocyte
eosinophil
destroy parasite
allergies
granulocyte
basophil
promote inflammation by releasing histamine and heparin
granulocyte
agranulocytes
monocyte
lymphocyte
monocyte
exit bloodstream and become macrophage
phagocytize pathogen and debris
agranulocyte