Diffusion in Multicellular Organisms (OCR GCSE Biology A, Combined (Gateway Science Suite)): Quizzes
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12 questions from this quiz
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Practise the questions
12 questions from this quiz
Why is diffusion alone often not enough in large multicellular organisms?
Why is diffusion alone often not enough in large multicellular organisms?
Diffusion over long distances is slow
What happens to the surface area to volume ratio as an organism grows larger?
What happens to the surface area to volume ratio as an organism grows larger?
Volume increases more than surface area
Which structures are examples of specialised surfaces for diffusion?
Which structures are examples of specialised surfaces for diffusion?
Lungs, gills, and intestines
What is the purpose of alveoli in the lungs having a large surface area?
What is the purpose of alveoli in the lungs having a large surface area?
To increase diffusion efficiency
How do thin membranes enhance diffusion in exchange surfaces?
How do thin membranes enhance diffusion in exchange surfaces?
They reduce the diffusion distance
What is the role of a rich blood supply near exchange surfaces?
What is the role of a rich blood supply near exchange surfaces?
To transport substances quickly
How do ventilation mechanisms in the lungs help diffusion?
How do ventilation mechanisms in the lungs help diffusion?
They maintain concentration gradients
In gas exchange in the lungs, oxygen diffuses from the alveoli into where?
In gas exchange in the lungs, oxygen diffuses from the alveoli into where?
The blood
What features of alveoli facilitate gas exchange?
What features of alveoli facilitate gas exchange?
Large surface area and thin walls
What is the function of villi and microvilli in the small intestine?
What is the function of villi and microvilli in the small intestine?
To increase surface area for diffusion
Which waste product is removed from the blood in the kidneys via diffusion?
Which waste product is removed from the blood in the kidneys via diffusion?
Urea
How does the circulatory system complement diffusion in multicellular organisms?
How does the circulatory system complement diffusion in multicellular organisms?
It transports substances efficiently