Summary GCSE Biology Edexcel - Paper 2 - Exchanges of Materials I

Gets oxygen to every cell in teh body and remove waste
products
Group of similar cells whihc work together to perform a specific function
Blood
Transports substances around the body

Cells are suspended in a liquid called plasma

Tranport oxygen around the body

Biconcave shape to give them a large surface area for absorbing
oxygen Adaptions
Contain haemoglobin which carries oxygen

No nucleus, so more room for haemoglobin

All body cells need oxygen for respiration - a process which Red blood cells
releases energy

Oxygen enters the lungs when you breathe in, then red blood
cells transport the oxygen from the lungs to all the cells in the
body

Lungs - oxygen diffuses into the blood, oxygen combines with Transporting oxygen
haemoglobin in red blood cells to become oxyhaemoglobin

In body tissues - oxyhaemoglobin spilts up into haemoglobin and Blood structure
oxygen to release oxygen to the cells

Help to defend against microorganisms that cause disease, part
of the immune system

Phagocytes - white blood cells that engulf and digest unwelcome
microorganisms - phaocytosis
White blood cells
Lymphocytes - produces antibodies