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AQA A-Level Biology Flashcards - Unit 3

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Study Level: A/AS Level
Examinator: AQA
Subject: A Level Biology
Unit: Unit 3 - Organisms exchange substances with their environment

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Uploaded on: September 8, 2025
Number of pages: 67
Written in: 2023/2024
Type: Other
Person: Unknown

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a level
a grade
biology
unit 3
exchange

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Unit 3 Flashcards

,What are the features of
specialised exchange
surfaces?

QUESTION

Large SA
Very thin shirt diﬀusion
distance
Selectively permeable
Moving external medium
conc grad
Moving internal medium
ANSWER

, How are respiratory gases
exchange along a diﬀusion
gradient in insects?

QUESTION
Oxygen conc falls at end of
tracheoles diﬀ grad established
Diﬀuses from atmosphere to
cells
CO2 rises there opposite diﬀ
grad established diﬀuses along
tracheoles to atmosphere
Diﬀuses faster in air than water
ANSWER

, How are respiratory gases
exchanged by mass
transport insects?

QUESTION

Muscles contract
Squeeze trachea
Mass movements of air in
and out
Speeds up exchange

ANSWER

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AQA A-Level Biology Flashcards - Unit 3

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