What do red blood cells do?
- Transport oxygen round the body
2. Contain haemoglobin
How are red blood cells adapted to the job?
- Don’t have a nucleus so more room for oxygen
2. Large surface area (donut shape)
What do capillaries do?
- Deliver food and oxygen to body tissues
- Remove CO2 and waste
- Walls one cell thick (easy for diffusion)
What is haemoglobin?
Chemical in red blood cells that combines reversibly with oxygen to make oxyhaemoglobin
What is plasma?
Liquid watery part of blood which carries:
- red and white blood cells and platelets
- CO2 to lungs
- urea to kidneys
- antibodies produced by white blood cells
What do veins do?
- collect the “used” blood and carry the blood back to the heart at low pressure
- pulmonary vein is the exception- carries oxygenated blood from lungs to heart
What do arteries do?
- Carry oxygenated blood away from the heart at high pressure
- Pulmonary artery is the exception - carries deoxygenated blood from heart to lungs
What do white blood cells do?
Fight micro organisms that cause disease
- Consume foreign cells
- Produce antibodies
- Produce anti toxins
What are two types of white blood cells?
- Phagocytes - ingest pathogens
2. Lymphocytes- produce anti bodies
What are platelets?
Fragments of larger cells that help blood to clot at a wound