Blood lecture 1 Flashcards
Cardiovascular system consists of
Heart, blood vessels, blood
Major function cardiovascular system
Deliver oxygen + nutrients
Hematology
study of blood,
Two fluids for transportation
Blood, interstitial fluid
Blood plasma
liquid connective tissue
Blood plasma composition
Water, plasma proteins, dissolved solutes
Blood transports what?
gases, nutrients, hormones, metabolic wastes
Blood regulates what?
pH, temperature, ion composition of IF
Functions of blood: protection
Restrict fluid loss
Defend toxins/pathogens
Avg. blood in adult
~5L
Whole blood =
blood w all components
2 major blood components
Plasma, formed elements
Plasma how much % of whole blood?
55%
Albumins % of plasma proteins
60%
Albumins function
Osmotic pressure
Globulins % of plasma proteins
35%
Antibodies (immunoglobins) function
attack foreign particles
Transport globulins functions
Bind ions, hormones, lipids
Fibrinogen % plasma proteins
~4%
Fibrinogen functions
blood clotting
Plasma solutes: Electrolytes
Essential for cellular activities
Plasma solutes: Organic nutrients
Cell ATP prod.
Plasma Solutes: Organic wastes
carried to breakdown or excretion sites
Formed elements % of blood
45%
% of formed elements RBC’s make up
99%
Formed elements: Platelets %
<0.1%
Formed elements: WBC’s %
<0.1%
Hematocrit
% of whole blood from formed elements
Lower hematocrit means
Anemia
Higher hematocrit means
Polycythemia
Hematopoiesis
How formed elements develop
RBC’s lifespan
~120 days
Hematopoiesis begins where?
Yolk sac - embryonic development
Hematopoiesis switches where after yolk sac?
Liver, spleen, thymus
Last 3 months pregnancy hematopoiesis happens where?
red bone marrow
Red bone marrow produces?
RBC, WBC, platelets
Pluripotent stem cell derived from
mesenchyme
Pluripotent stem cells give rise to?
Lymphoid, myeloid
Lymphoid give rise to
lymphocytes, natural killer cells
Myeloid give rise to
neutrophils, monocytes, eosinophils, basophils, RBC, platelets
Progenitor cells known as
CFU - colony forming unit
Progenitor cells committed to give rise to
Specific elements of blood
CFU-E becomes
Erythrocytes
CFU-Meg becomes
Megakaryocytes -> platelets
CFU-GM becomes
Granulocytes
Precursor cells become
Actual blood cells
Optional step: RBC (slightly immature RBC name)
Reticulocyte (slightly immature RBC)
Optional step: Platelet precursor name
Megakaryocyte (platelet precursor)
Hemopoietic Growth Factors are what?
Hormones that regulate differentiation/proliferation of CFU’s
EPO - Erythropoetin stimulates what? and released where?
RBC prod. // released kidneys
TPO - Thrombopoetin stimulates what? released where?
Prod. of thrombocytes // released liver
Cytokines stimulate what?
WBC prod.
Blood samples obtained via
venipuncture
m/c site for venipuncture
median cubital vein
Complete blood count determines
1 cubic ml of blood components
WBC differential count
Identify # of each WBC type
RBC tests can detect what?
Can detect internal bleeding