《生理学》Chapter 3 Blood.ppt

文档介绍：Chapter 3 Blood
Section 1
ponents and its properties
生理教研室:潘敬运教授
Functions of blood
1. Place of exchange of substances between interstitial fluid and external environment
2. Transport
3. Buffer function
4. To keep body temperature relatively constant
5. Hemostasis
6. Defense function
1. Components of blood
plasma
blood cells:
red blood cells (erythrocytes)
white blood cells
platelets
Blood volume: 70-80ml/Kg, 7-8% of body
weight
Hematocrit
men is about 40~50%,
women is about 37~48%.
2. Physical and chemical properties  of blood
(1) Specific gravity
blood: ~. RBC number
plasma: ~. Content of
plasma proteins
RBC: ~. hemoglobin
(2) Viscosity Viscosity of plasma is - times  that of water, viscosity of whole  blood is times of plasma.
Factors of affecting viscosity a. hemotocrit
b. Shear rate  Shear is a ratio of velocity difference  of adjacent layers to distance  between two fluid layers in laminar  flow.