Lecture 3 Flashcards
function of ventilatory system
- to facilitate exchange of C02 and 02 between the environment
blood functions
1- transportation
2- temp regulation
3- acid base (ph) balance
composition of blood
8% of body weight
- viscosity 5x water
plasma - 46-63%
formed elements - 37-55%
formed individual elements of blood
1- erthrocytes (RBC)
2- leukocyts (WBC)
3- platletes
erthrocytes
- circulation time = 1min
- lifespan = 120days
- produced by red bone marrow
haematocrit
% of RBC in whole blood
erythropoises
2 million RBC created per sec (testostrone runs this process)
EPO is stimulated by
- hypoxia (anemia)
- decreased 02 availability (altitude)
- increased 02 demand (exrecise training)
how much haemglobin is carried in our bodies
- in men each 100ml of blood carried 15g of haemglobin
- in woman 14g
blood 02 carrying capacity
each 1 gram of haemglobin can carry 1.34mls of 02
haemglobin contains
1- iron
2- protein
amnemia
- low 02 carrying capacity
- insufficent RBC
- decreased Hb content of the blood
transfusing blood
athletes remove some of their blood = RBC (count drops and body makes more cells in compensation)
Synthetic erythropoietin (EPO)
- increased red blood cell production
benefits of blood transfusion and epo
- 9% increase in v02 max
- 23% increase in endurance time
