gas exchange

Question 1

Explain how the body surface of a single-celled organism is adapted for gas
exchange

Answer 1

thin flat shape
large surface area to volume ratio
short diffusuin distance to all parts of cell so rapid diffusion

Question 2

tracheal system of insect

Answer 2

spircales pores on surface that can open and close to allow diffusion
trachea - large tubes full of air that allow diffusion
Tracheoles = smaller branches from tracheae, permeable to allow gas exchange with cells

Question 3

Explain how an insect’s tracheal system is adapted for gas exchange

Answer 3

tracheoles thin walls so short diffusuin distance to all cells
high numbers of highly branched trachioles large surface area
trachea provide tubes full of air so fast diffusion
contraction of abdominal muscles changes pressure in body causing air to move in and out
maintains conc gradient for diffusion

Question 4

Explain structural and functional compromises in terrestrial insects that
allow efficient gas exchange while limiting water loss