Circulatory System

Question 1

Transport of oxygen formula

Answer 1

Hb + O(2) –> <– HbO(2)

Question 2

How is oxygen transported?

Answer 2

3% in blood plasma
97% carried by haemoglobin molecules in RBC -> oxyhaemoglobin

Question 3

Why are red blood cells well suited for the transport of oxygen?

Answer 3

Haemoglobin is able to bind with oxygen, they have no nucleus (makes room for haemoglobin), biconcave disc structure (large surface area)

Question 4

Transport of carbon dioxide formula

Answer 4

CO(2) + H(2)O –> <– H(2)CO(3) –> <–H + HCO(3)

Question 5

Where is carbon dioxide transported in the blood?

Answer 5

8% is plasma, 22% combines with the globin part of haemoglobin –> carbaminohaemoglobin, 70% in plasma as bicarbonate ions HCO(3)

Question 6

Artery structure

Answer 6

Moves away from the heart; Small bore, thick muscular wall, no valve, blood under high pressure.

Question 7

Vein structure

Answer 7

Moves to the heart; Large bore, thin elastic wall, valve, blood under low pressure.

Question 8

Diastole

Answer 8

Heart muscle relaxes

Question 9

Systole

Answer 9

Heart muscle contracts