Gas Exchange in Single-celled Organisms & Insects (AQA A-Level Biology): Quizzes
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Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
Why can single-celled organisms rely on simple diffusion for gas exchange?
Why can single-celled organisms rely on simple diffusion for gas exchange?
They have a large surface area to volume ratio
Where does oxygen enter single-celled organisms?
Where does oxygen enter single-celled organisms?
Directly across the body surface
What is the fundamental challenge faced by terrestrial insects?
What is the fundamental challenge faced by terrestrial insects?
Balancing gas exchange and water loss
What are tracheoles?
What are tracheoles?
Smaller tubes that tracheae divide into
What advantage does the tracheal system provide?
What advantage does the tracheal system provide?
Air delivered directly to tissues
How does cellular respiration create a diffusion gradient in tracheoles?
How does cellular respiration create a diffusion gradient in tracheoles?
Consumes , reducing its concentration
How do insects use mass transport to move gases?
How do insects use mass transport to move gases?
Muscle contraction compresses tracheae
Why does lactate production draw air further into tracheoles?
Why does lactate production draw air further into tracheoles?
It lowers water potential, water moves out
Why do insects keep spiracles closed most of the time?
Why do insects keep spiracles closed most of the time?
To minimise water loss
Why does the tracheal system limit insect body size?
Why does the tracheal system limit insect body size?
Diffusion pathways must remain short