blood

Question 1

What do red blood cells do?

Answer 1

1. Transport oxygen round the body

2. Contain haemoglobin

Question 2

How are red blood cells adapted to the job?

Answer 2

1. Don’t have a nucleus so more room for oxygen

2. Large surface area (donut shape)

Question 3

What do capillaries do?

Answer 3

1. Deliver food and oxygen to body tissues
2. Remove CO2 and waste
3. Walls one cell thick (easy for diffusion)

Question 4

What is haemoglobin?

Answer 4

Chemical in red blood cells that combines reversibly with oxygen to make oxyhaemoglobin

Question 5

What is plasma?

Answer 5

Liquid watery part of blood which carries:

1. red and white blood cells and platelets
2. nutrients
3. CO2 to lungs
4. urea to kidneys
5. hormones
6. antibodies produced by white blood cells

Question 6

What do veins do?

Answer 6

1. collect the “used” blood and carry the blood back to the heart at low pressure
2. pulmonary vein is the exception- carries oxygenated blood from lungs to heart

Question 7

What do arteries do?

Answer 7

1. Carry oxygenated blood away from the heart at high pressure
2. Pulmonary artery is the exception - carries deoxygenated blood from heart to lungs

Question 8

What do white blood cells do?

Answer 8

Fight micro organisms that cause disease

1. Consume foreign cells
2. Produce antibodies
3. Produce anti toxins

Question 9

What are two types of white blood cells?

Answer 9

1. Phagocytes - ingest pathogens

2. Lymphocytes- produce anti bodies

Question 10

What are platelets?

Answer 10

Fragments of larger cells that help blood to clot at a wound