1

Blood CellsBlood Cells

(Extended Study) (Extended Study) HL onlyHL only

3.2.3.H3.2.3.H

2

First revise 3.2.2First revise 3.2.2

(Basic details about blood and blood cells) (Basic details about blood and blood cells) HL & OLHL & OL

Learning objectivesLearning objectives

1. Details of red blood cell structure &function

2. Details of two types of white blood cells

(a) Lymphocytes

(b) Monocytes

Composition of BloodComposition of Blood

Plasma Liquid part of the blood

Red Blood Cells

White Blood Cells

Platelets

Functions of blood partsFunctions 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

Red Blood CellsRed 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

White Blood CellsWhite 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

PLATELETSPLATELETS

Cell fragments

Made in bone marrow

No nucleus

Function in clotting

PlasmaPlasmaComposed 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

Learning checkLearning 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

See alsoSee also

Section 3.2.2 Organisational Complexity of the Human for introduction to Blood and Circulation

EndEnd