Diffusion in Multicellular Organisms (AQA GCSE Biology Combined Science): Flashcards
📚Flashcards
Practise the cards
10 cards from this deck
ShowHide
Practise the cards
10 cards from this deck
Why diffusion alone isn't enough in large multicellular organisms
Why diffusion alone isn't enough in large multicellular organisms
Many cells are far from external environment; diffusion over long distances is slow and inefficient
Location of many cells in large organisms
Location of many cells in large organisms
Far from the external environment
What increases faster as organisms grow larger
What increases faster as organisms grow larger
Volume increases more rapidly than surface area
Examples of specialised diffusion structures
Examples of specialised diffusion structures
Lungs, gills, and intestines
One key feature of alveoli that enhances diffusion
One key feature of alveoli that enhances diffusion
Large surface area
Why thin membranes speed up diffusion
Why thin membranes speed up diffusion
Reduce the distance for diffusion
How ventilation mechanisms help diffusion in lungs
How ventilation mechanisms help diffusion in lungs
Maintain concentration gradients
Direction of oxygen diffusion in lungs
Direction of oxygen diffusion in lungs
From alveoli into the blood
Structures increasing surface area in small intestine
Structures increasing surface area in small intestine
Villi and microvilli
What circulatory system transports
What circulatory system transports
Oxygen, nutrients, and waste products