1 / 11

Blood Chapter 12

Blood Chapter 12. Objectives: Identify components of blood. Describe blood cell formation. Distinguish among human blood groups. Blood and Blood Cells. Blood consists of: Liquid portion – plasma Solid portion: Red blood cells (RBC’s) White blood cells (WBC’s) Platelets.

raquel
Download Presentation

Blood Chapter 12

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. BloodChapter 12 Objectives: Identify components of blood. Describe blood cell formation. Distinguish among human blood groups.

  2. Blood and Blood Cells • Blood consists of: • Liquid portion – plasma • Solid portion: • Red blood cells (RBC’s) • White blood cells (WBC’s) • Platelets

  3. Blood Volume & Composition • Average adult has blood volume of about 5 liters (5.3 quarts or ______ gallons). • Men – about 1.5 gallons • Women – about 0.875 gallons • Hematocrit– the % of cells per volume in a blood sample • Normal is about 45%. • What does it mean if the percentage is low? • What does it mean if the percentage is high?

  4. RBC’s • AKA, erythrocytes • Biconcave disks (???) • Increases the surface area through which gases can diffuse • Places the cell membrane closer to oxygen-carrying hemoglobin in the cell

  5. RBC’s, continued….. • Hemoglobin: • Makes up about 1/3 of RBC • Protein – responsible for color of blood (???) • Oxyhemoglobin – bright red • Deoxyhemoglobin – darker • RBC’s extrude (???) their nuclei when mature • Makes more room for hemoglobin • Cannot divide

  6. RBC Count (RBCC or RCC) • The number of RBC’s in a mm3 of blood • 4,600, 000 – 6,200,000 for men • 4,200,000 – 5,400,000 for women • How much is 1 mm3?

  7. RBC Production and Control • Hemapoiesis: RBC’s are produced in yolk sac, liver, spleen, and red bone marrow • Average life span of RBC = 120 days • Production is controlled by a homeostatic mechanism controlled by the hormone erythropoietin.

  8. RBC Production Control • Decreased environmental oxygen levels stimulate kidneys and liver to release erythropoietin. • Erythropoietin travels to red bone marrow and stimulates RBC production. • New RBC’s appear in the blood in a few days. • When oxygen levels return to normal, erythropoietin levels and RBC production both decrease.

  9. Destruction of RBC’s • RBC’s, especially older ones, can be damaged by passing through capillaries. • Damaged RBC’s are destroyed by macrophages in the spleen and liver. • The leftover hemoglobin is broken down, and the iron portion may be returned to the red bone marrow to be reused to make new hemoglobin.

  10. White Blood Cells (WBC’s) • AKA, leukocytes • What is their job? • 5 types of WBC’s – differ in: • Size • Nature of their cytoplasm • Nucleus shape • Staining characteristics

  11. Types of WBC’s • Use the information found on pp.311-313 to complete the table. Some info can be found in Table 12.1, p.314.

More Related