Diffusion in Multicellular Organisms (AQA GCSE Biology): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
Why is diffusion alone often insufficient in large multicellular organisms?
Why is diffusion alone often insufficient in large multicellular organisms?
It is slow and inefficient over long distances
What happens to surface area and volume as organisms grow larger?
What happens to surface area and volume as organisms grow larger?
Volume increases more rapidly than surface area
Which specialised structures maximise diffusion efficiency in multicellular organisms?
Which specialised structures maximise diffusion efficiency in multicellular organisms?
Lungs, gills, and intestines
Which structures provide a large surface area for diffusion?
Which structures provide a large surface area for diffusion?
Alveoli in lungs and villi in intestines
How do thin membranes improve diffusion?
How do thin membranes improve diffusion?
They reduce the distance for diffusion
What is the role of a rich blood supply near exchange surfaces?
What is the role of a rich blood supply near exchange surfaces?
Transports substances quickly to/from cells
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, where does oxygen diffuse in the lungs?
In gas exchange, where does oxygen diffuse in the lungs?
From alveoli into blood
Where does carbon dioxide diffuse during gas exchange in the lungs?
Where does carbon dioxide diffuse during gas exchange in the lungs?
From blood into alveoli
What is the function of villi and microvilli in the small intestine?
What is the function of villi and microvilli in the small intestine?
Increase surface area for nutrient diffusion
Which waste product is removed from blood in the kidneys via diffusion?
Which waste product is removed from blood in the kidneys via diffusion?
Urea
What does the blood circulatory system transport?
What does the blood circulatory system transport?
Oxygen, nutrients, and waste products