Gas Exchange in the Alveoli (Leaving Cert Biology): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
How many bronchioles does each bronchus branch into?
How many bronchioles does each bronchus branch into?
About 1 million
What is the name of the sac that each bronchiole ends in?
What is the name of the sac that each bronchiole ends in?
Alveolus
Why do alveoli have a large surface area?
Why do alveoli have a large surface area?
For efficient gas exchange
What is the purpose of moist surfaces in the alveoli?
What is the purpose of moist surfaces in the alveoli?
Allow gases to diffuse more quickly
Why do alveoli have elastic walls?
Why do alveoli have elastic walls?
For efficient inhalation & exhalation
What percentage of each alveolus surface is covered by capillaries?
What percentage of each alveolus surface is covered by capillaries?
90%
What happens to red blood cells as they squeeze through narrow capillaries?
What happens to red blood cells as they squeeze through narrow capillaries?
They slow down
What does oxygen bind to in red blood cells?
What does oxygen bind to in red blood cells?
Haemoglobin
Which gas diffuses from the blood into the alveolus to be exhaled?
Which gas diffuses from the blood into the alveolus to be exhaled?
Carbon dioxide
Diffusion is the movement of substances from high to low what?
Diffusion is the movement of substances from high to low what?
Concentration
Which blood vessel returns blood to the heart from the lungs?
Which blood vessel returns blood to the heart from the lungs?
Pulmonary vein
How is oxygen transported in the blood returning from the lungs?
How is oxygen transported in the blood returning from the lungs?
By (oxy)haemoglobin in red blood cells