Red Blood Cells

Question 1

Small size

Answer 1

Increases surface area

Question 2

Contains lots of the pigment haemoglobin that binds to oxygen

Answer 2

Transport oxygen

Question 3

Contains an enzyme that combines CO2 with water

Answer 3

To transport CO2

Question 4

Bi-concave disc shape

Answer 4

Increases surface-area to volume ratio
Makes them flexible so they can squeeze through capillaries

Question 5

No membrane-bound organelles

Answer 5

Makes more space for haemoglobin