Transport in Cells (AQA GCSE Biology): Flashcards
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Practise the cards
13 cards from this deck
Why single-celled organisms exchange materials easily
Why single-celled organisms exchange materials easily
Small & everything close to cell membrane
Why multicellular organisms need special exchange surfaces
Why multicellular organisms need special exchange surfaces
Bigger, cells far from outside environment
SA:V ratio in single-celled organisms
SA:V ratio in single-celled organisms
High - lots of surface area compared to volume
What happens to SA:V ratio as organisms get bigger
What happens to SA:V ratio as organisms get bigger
Gets smaller - less surface compared to volume
3 features of effective exchange surfaces
3 features of effective exchange surfaces
Large SA, short diffusion distance, good blood supply
Why large surface area helps exchange
Why large surface area helps exchange
More space for materials to move, increases exchange rate
How exchange surfaces achieve short diffusion distance
How exchange surfaces achieve short diffusion distance
Often just one cell thick
Role of good blood supply in exchange
Role of good blood supply in exchange
Maintains concentration gradients by moving materials
What are villi
What are villi
Tiny finger-like structures in small intestine
What are alveoli
What are alveoli
Millions of tiny air sacs in lungs
What are gill filaments
What are gill filaments
Thin structures in fish gills that increase surface area
Typical thickness of exchange surface walls
Typical thickness of exchange surface walls
One cell thick
Example of exchange surface with folded surface
Example of exchange surface with folded surface
Villi in small intestine