Chapter 3 Blood

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Chapter 3 Blood

• Section 1
• Blood components and its properties

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• 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

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• 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

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Hematocrit

• men is about 4050,
• women is about 3748.

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• 2. Physical and chemical properties of blood
• (1) Specific gravity
• blood 1.0501.060. RBC number
• plasma 1.0251.030. Content of
• plasma proteins
• RBC1.090 1.092. hemoglobin

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(2) Viscosity Viscosity of plasma is 1.2-1.3
times that of water, viscosity of whole
blood is 2.4 times of plasma.
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Factors of affecting viscosity a. hemotocrit
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b. Shear rate Shear is a ratio of velocity
difference of adjacent layers to distance
between two fluid layers in laminar
flow.
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• (3) plasma osmolality