Blood

Question 1

What does the plasma do? (6)

Answer 1

Transports all the blood cells around the body
Transports carbon dioxide from your cells into your lungs
Transports urea from your liver to your kidneys
Transports digested food around your body
Transports hormones around your body
Distributes heat from the liver and muscles

Question 2

Red blood cells

Answer 2

• Cannot reproduce and have no nucleus - gives more space to pack in haemoglobin
• The cells are biconcave discs. Gives a larger surface area;volume ratio for the diffusion of oxygen
• 50 for each white blood cell

Question 3

What is haemoglobin and how does it work?

Answer 3

• Large protein molecule folded around four iron atoms
• In high oxygen concentrations, reacts with oxygen and forms OXYHEMOGLOBIN
• In low oxygen concentrations, the reaction reverses to give HAEMOGLOBIN and OXYGEN K

Question 4

What is blood made of? (5)

Answer 4

Plasma - (pale yellow) involved in transport around your body
Red Blood Cells - involved in transport of oxygen around the body
White Blood Cells - part f your bodies defence against disease
Platelets - involved in the clotting of your blood
Dissolved food, hormones etc