3.2.3
Blood Cells
(Extended Study)
HL only
1
First revise 3.2.2
(Basic details about blood and blood cells)
HL & OL
2
Learning objectives
1.
Details of red blood cell structure &function
2. Details of two types of white blood cells
(a)
Lymphocytes
(b)
Monocytes
Composition of Blood
Plasma
Red Blood Cells
White Blood Cells
Platelets
Liquid part of the blood
Functions of blood parts
Plasma
Composed of mainly water which acts as a
transport medium for the cells and dissolved
substances
Red Blood Cells
Carry Oxygen
White Blood Cells
Fight Infection
Platelets
Clotting
Red Blood Cells
Biconcave discs
……gives large surface area
No Nucleus
No mitochondria
Contain Haemoglobin…(has a high affinity for oxygen)
Flexible Cell membranes
Made in bone marrow of ribs & sternum
White Blood Cells
Have a Nucleus
No definite shape
Formed in bone marrow
and mature in spleen
Protect against disease
Two types
1.
Lymphocytes
Produce antibodies
2.
Monocytes
Engulf microorganisms
PLATELETS
Cell fragments
No nucleus
Made in bone
marrow
Function in clotting
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
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
See also
Section 3.2.2 Organisational Complexity of the
Human for introduction to Blood and ciriculation
End