Quiz #2 Flashcards
blood functions
transport, regulation, protection
spun tube of blood layers (bottom to top)
erythrocytes, WBCs, plasma
Buffy coat
thin, whitish layer between RBCs and plasma layers
WBCs and platelets found in
buffy coat
Blood colors
high O2 (scarlet red); low O2 (dark red)
blood pH
7.35-7.45
Which formed element has the only complete cells
WBCs
RBCs have no…
nuclei or other organelles
Erythrocyte functions
respiratory gas exchange
Erythropoietin (EPO)
hormone that stimulates formation of RBCs
EPO is released in ____ in response to _____
kidneys; hypoxia
What inhibits erythrocyte production?
too many or high oxygen levels in blood
Anemia
not enough RBCs being produced
Sickle Cell Anemia
cells become crescent shaped
Thalassemias
one globin chain is absent or faulty; RBCs are thin, delicate, and deficient in hemoglobin
Polycythemia
abnormal excess of RBCs; increases blood viscosity, causing sluggish blood flow
Leukocytes function
in defense against disease
two types of Leukocytes
granulocytes, agranulocytes
granulocytes
contain visible cytoplasmic granules
agranulocytes
do not contain visible cytoplasmic granules
Platelet formation
hematopoietic stem cell, megakaryoblast, megakaryocyte, megakaryocyte
hemostasis
fast series of reactions for stoppage of bleeding
three steps of hemostasis
vascular spasm, platelet plug formation, coagulation (blood clotting)
RBC formation
(1) stimulus (hypoxia);(2) kidney releases erythroprotein; (3) erythroprotein stimulates red bone marrow; (4) enhanced erythropoiesis increases RBC count; (5) O2-carrying ability of blood rises
