Gas Exchages

Question 1

What do red blood cells do

Answer 1

They carry Oxygen

Question 2

Who was the first scientist to correctly describe how blood moved around the body.

Answer 2

William Harvey

Question 3

Plasma

Answer 3

• Plasma on its own is actually is yellow.

1. Plasma transports substances around the body e.g. carbon dioxide, red blood cells, white blood cells and heat
2. Plasma is an excellent solvent as it is 90% water.

Question 4

Platelets

Answer 4

1. To prevent blood loss.
2. To prevent the entry of microorganisms.
• Haemophiliacs have a platelet deficiency and cannot clot the blood.

Question 5

White blood cells

Answer 5

• Function: To fight against infection caused by microorganisms.

Question 6

Arteries

Answer 6

• Arteries carry blood Away from the heart.

Question 7

Veins

Answer 7

Veins carry blood towards the heart.

Question 8

Capillaries

Answer 8

• Capillaries connect arteries and veins and it is here where the substances are exchanged between cells.