june 2020- paper 3

Question 1

how would consuming high levels of sodium impact blood volume? (3)

Answer 1

• Na+ lower blood water potential
• water would move into the blood via osmosis
• increasing blood volume

Question 2

why does exercise not increase pCO2 in air breathed out? (2)

Answer 2

• increase in breathing rate

- similar pCO2 per breath, but more breaths