1 / 15

Understanding Blood Components and Their Functions in the Human Body

Blood is vital for various physiological processes, comprising plasma, red blood cells, white blood cells, and platelets. Its primary functions include the exchange of substances, transport of nutrients and gases, buffering against pH changes, maintaining body temperature, hemostasis, and defense against pathogens. The average blood volume ranges from 70-80 ml/kg, constituting 7-8% of body weight. Key characteristics such as hematocrit levels, viscosity, and osmolality provide insights into blood's physical and chemical properties, elucidating its role in homeostasis and overall health.

autumn-lancaster
Télécharger la présentation

Understanding Blood Components and Their Functions in the Human Body

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 3 Blood Section 1 Blood components and its properties

  2. 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止血 6. Defense function

  3. 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

  4. Hematocrit血细胞比容 men is about 40～50%, women is about 37～48%.

  5. 2. Physical and chemical propertiesof blood (1) Specific gravity 比重 blood: 1.050～1.060. RBC number plasma: 1.025～1.030. Content of plasma proteins RBC:1.090 ～1.092. hemoglobin

  6. (2) Viscosity粘性Viscosity of plasma is 1.2-1.3 times that of water, viscosity of whole blood is 2.4 times of plasma.

  7. Factors of affecting viscosityhemotocrit血细胞比容

  8. (3)plasma osmolality — 313 mOsm/Kg H20.

  9. Osmotic pressure is determined by the number of particle, instead of the mass of the solute..

  10. At 37℃, 1 osmolality will cause 19300 mmHg osmotic pressure.Plasmaosmolality is 0.313Osm /Kg. H20 0.313×19300 = 5330 mmHg

  11. Colloid胶体 osmotic pressure: maintain intra-and extra-capillary water equilibrium Crystal晶体 osmotic pressure: maintain intra-and extracellular water equilibrium

  12. Isoosmotic solution等渗hyperosmotic solutionhypoosmotic solutionIsotonic solution等张

  13. 3. RBC fragility. 0.42% NaCl solution--begin hemolysis溶血 0.35%NaCl solution--complete hemolysis 4. Plasma pH 7.35-7.45

More Related