1. 1 Blood Cells (Extended Study) HL only 3.2.3.H

2. 2 First revise 3.2.2 (Basic details about blood and blood cells) HL & OL

3. Learning objectives 1.Details of red blood cell structure &function 2.Details of two types of white blood cells (a)Lymphocytes (b)Monocytes

4. Composition of Blood Plasma Liquid part of the blood Red Blood Cells White Blood Cells Platelets

5. Functions of blood parts Plasma Red Blood Cells White Blood Cells Platelets Composed of mainly water which acts as a transport medium for the cells and dissolved substances Carry Oxygen Fight Infection Clotting

6. Red Blood Cells Biconcave discs ……gives large surface area No Nucleus Flexible Cell membranes Made in bone marrow of ribs & sternum Contain Haemoglobin…( has a high affinity for oxygen) No mitochondria

7. White Blood Cells Two types Have a Nucleus 1.Lymphocytes Formed in bone marrow and mature in spleen 2.Monocytes Protect against disease No definite shape Produce antibodies Engulf microorganisms

8. PLATELETS Cell fragments Made in bone marrow No nucleus Function in clotting

9. Plasma Composed of mainly water which as a transport medium for the cells and dissolved substances Dissolved substances include Digestion products ….Glucose, amno acids, Fatty acids, glycerol, minerals and vitamins Waste….Carbon dioxide, urea Hormones….eg Insulin Antibodies

10. Learning check 1.List four ways, other than colour, in which red blood cells are different from ordinary body cells 2.Name the chemical in red blood cells that has a high affinity for oxygen 3. Name two types of white blood cells and give the function of each type

11. See also Section 3.2.2 Organisational Complexity of the Human for introduction to Blood and Circulation

12. End