Exam 4 Flashcards
(202 cards)
hematopoiesis
- blood cell production
- occurs within the bone marrow: produces RBCs, WBCs, and platelets
what are nondifferentiated immature blood cells in the bone marrow called?
stem cells
why might the body make more RBCs?
loss of blood, anemia, need more O2
how much of our blood does plasma constitute?
55% of blood
what is plasma composed of?
primarily of water but also contains proteins, electrolytes, gases, nutrients, and waster products
serum plasma
refers to plasma minus its clotting factors ~ has everything to do with hydration
how much of our blood do blood cells constitute?
45%
erythrocytes
RBCs ~ oxygen transportation
leukocytes
WBCs ~ protection from infection
thrombocytes
platelets ~ promote coagulation
normal platelet count
150-450
what does hematocrit show?
hydration status
if you give fluids, what will H&H be like?
low
erythropoiesis
- making RBCs
- stimulated by hypoxia
- controlled by erythropoietin (created by kidneys)
what do reticulocytes do?
mature into RBCs and are a good indication of production rates
what does hemolysis do?
removes abnormal, defective, damaged, and old RBCs from circulation
if someone is in kidney failure, what can we expect?
them to be anemia
two types of leukocytes
- granulocytes
- agranulocytes (have to do with immunity)
types of granulocytes
- neutrophils (most common)
- eosinophils
- basophils
types of agranulocytes
- lymphocytes
- monocytes
why would neutrophils be increased?
due to bacterial infection
neutrophils
- primary function is phagocytosis
- primary phagocytic cells involved in acute inflammatory response
- mature neutrophil is segmented (“seg”)
- immature neutrophils are called bands
- first site of infection
an increase in percent of bands is called what?
a shift to the left, meaning bone marrow is releasing less-mature cells into circulation in response to a site of injury (increased in acute infection and inflammation)
life-span of neutrophils
2-14 days