Gas Exchange in Single-celled Organisms & Insects (AQA A-Level Biology): Flashcards
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Practise the cards
10 cards from this deck
Why large surface area to volume ratio helps single-celled organisms
Why large surface area to volume ratio helps single-celled organisms
Enables efficient gas exchange via diffusion
Insect internal tube network for gas exchange
Insect internal tube network for gas exchange
Tracheae
Smaller branches of tracheae
Smaller branches of tracheae
Tracheoles
Mechanism 1: Gas movement in insects
Mechanism 1: Gas movement in insects
Diffusion gradient
Mechanism 2: Gas movement in insects
Mechanism 2: Gas movement in insects
Mass transport via muscle contraction
Effect of lactate on tracheoles during high activity
Effect of lactate on tracheoles during high activity
Water moves out by osmosis, air drawn in
Pores for gas exchange in insects
Pores for gas exchange in insects
Spiracles
Why spiracles kept closed most of the time
Why spiracles kept closed most of the time
To minimise water loss
Why insects are relatively small
Why insects are relatively small
Short diffusion pathways required for tracheal system
What prevents tracheae from collapsing
What prevents tracheae from collapsing
Strengthened rings