Features of Transport Systems (AQA A-Level Biology): Flashcards
📚Flashcards
Practise the cards
10 cards from this deck
ShowHide
Practise the cards
10 cards from this deck
Why large organisms can't rely on surface exchange alone
Why large organisms can't rely on surface exchange alone
SA:V ratio becomes too small to meet metabolic demands
What happens to SA:V ratio as organisms grow larger
What happens to SA:V ratio as organisms grow larger
It decreases (volume increases faster than surface area)
Examples of specialist exchange surfaces
Examples of specialist exchange surfaces
Lungs (gas exchange), intestines (nutrient absorption)
Purpose of transport systems in large organisms
Purpose of transport systems in large organisms
Move materials between exchange surfaces and body cells
Two factors determining need for transport system
Two factors determining need for transport system
Surface area to volume ratio and activity level
Typical transport medium in organisms
Typical transport medium in organisms
Water-based liquid (e.g. blood)
Definition of mass transport
Definition of mass transport
Transport medium moves in bulk over large distances
Function of closed tubular vessels
Function of closed tubular vessels
Contain and direct transport medium throughout organism
How animals achieve pumping in transport systems
How animals achieve pumping in transport systems
Muscular contraction (body muscles or heart)
How plants achieve pumping in transport systems
How plants achieve pumping in transport systems
Natural passive processes (e.g. water evaporation)