Exchange Between Organisms & their Environment (AQA A-Level Biology): Flashcards
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Practise the cards
10 cards from this deck
Tissue fluid role
Tissue fluid role
Intermediary between exchange surfaces and cells
Where exchange processes occur
Where exchange processes occur
At specialised surfaces, across cell plasma membranes
Mass transport system function
Mass transport system function
Maintains concentration gradients for efficient diffusion
2 factors affecting exchange requirements
2 factors affecting exchange requirements
Organism size and metabolic rate
Respiratory gases exchanged
Respiratory gases exchanged
Oxygen enters; carbon dioxide removed
Examples of nutrients requiring exchange
Examples of nutrients requiring exchange
Glucose, fatty acids, amino acids, vitamins, minerals
Excretory products requiring removal
Excretory products requiring removal
Urea and excess carbon dioxide
Passive transport definition
Passive transport definition
Transport requiring no metabolic energy (diffusion/osmosis)
Active transport energy source
Active transport energy source
Metabolic energy, usually ATP
Why large organisms need complex transport systems
Why large organisms need complex transport systems
Greater distance between exchange surfaces and cells