Blood safese. One of its jobe te to act as a huge transport system.
Main things in blood
Red Blood Cells
White Blood Cells
Platelets
Plasma
Red Blood Cells
Carry oxygen from the lungs to all the cells in the body
Biconcave disc shape for large surface area
No nucleus for more room to carry oxygen
Contain haemoglobin
Oxygen transport in red blood cells
1. In lungs, haemoglobin binds to oxygen to become oxyhaemoglobin
2. In body tissues, oxyhaemoglobin splits up into haemoglobin and oxygen to release oxygen to the cells
White Blood Cells
Defend against infection
Some can change shape to gobble up microorganisms (phagocytosis)
Others produce antibodies and antitoxins to fight microorganisms
Have a nucleus
More red blood cells
More oxygen can get to your cells
Less oxygen in the air at high altitudes
People produce more red blood cells to compensate
Platelets
Help blood to clot at a wound
Have no nucleus
Lack of platelets can cause excessive bleeding and bruising
Plasma
Pale straw-coloured liquid that carries everything in blood including red/white blood cells, platelets, nutrients, carbon dioxide, urea, hormones, proteins, antibodies and antitoxins
