LO
• To be able to know the components
• To be able to know functions of blood

Plasma
• This is the yellowish liquid portion of the blood that contains electrolytes, nutrients and vitamins and hormones as well as red blood cells, white blood cells and platelets.

1. Transport nutrients throughout the body
2. Maintain Blood Volume
3. Balance Electrolytes (salts) in the body

Red blood cells

Red blood cells
• Red blood cells carry oxygen from your lungs to your heart, and then to your muscles.
• They help to remove the carbon dioxide from the body.
• They contain haemoglobin, which combines with oxygen.
• They have no nucleus and a biconcave shape to give the most space for oxygen.

Red blood cells
• They are like a mailman.
• Why?

White blood cells

White blood cells
• They are part of the immune system
• White blood cells protect the body from infections.
• There are several ways they can do this
– Phagocytosis:

White blood cells
• Certain types of white blood cells produce antibodies to fight infections
• Certain WBCs called lymphocytes can produce “memory cells” so that if the body is infected again it can fight it quickly.

White blood cells
• They are like a policeman.
• Why?

Platelets
• These help the blood to clot if you get a cut.

Platelets
• They are like a doctor.
• Why?

Blood
• Red blood cells –
44%
• Plasma – 55%
(90% water)
• White blood cells –
0.5%
• Platelets - 0.5%
Represent the above information using a pie chart

suspended in a straw coloured liquid called products; and protect the body against
???
Different components of the blood carry out
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different roles.
Word bank: roles, cells, plasma, infection, blood, waste, oxygen,

Blood is made up of four different things:
Plasma – 55%
Red blood cells – 44%
Platelets – 0.05%
White blood cells – 0.05%
Represent the above information using a pie chart