Exchange surfaces and transport exam qs

Question 1

Explain how she could improve her experiment

Answer 1

• Carrying out repeats and calculating an average

Question 1

Suggest one other reason for rapid diffusion

Answer 1

• Short diffusion pathway
• Partially permeable membrane
• Large maintained concentration gradient

Question 2

Small mammals have a higher metabolic rate than larger mammals explain why

Answer 2

• This is because they have a larger surface area to volume ratio so faster heat loss so they need to generate more heat (via respiration)

Question 3

Explain why filaments are needed in breeding season (example)

Answer 3

• Lungs arent suitable for breathing underwater
• Filaments increase surface area to volume ratio
• Filaments allow effiecnient gas exhange through the skin
• They can prevent water loss and keeps skin moist