Gaseous Exchange System in Mammals (OCR A-Level Biology A): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
ShowHide
Practise the questions
10 questions from this quiz
Why do larger organisms require specialised gas exchange systems?
Why do larger organisms require specialised gas exchange systems?
Volume increases faster than surface area
What is the SA:V ratio of a cube with side length 2.0 cm?
What is the SA:V ratio of a cube with side length 2.0 cm?
3:1
What is the correct sequence of air passage through the respiratory system?
What is the correct sequence of air passage through the respiratory system?
Trachea → bronchi → bronchioles → alveoli
What is the function of pleural fluid?
What is the function of pleural fluid?
Provides lubrication, reduces friction
Approximately how many alveoli does an adult human have?
Approximately how many alveoli does an adult human have?
500-700 million
What type of epithelium makes up the alveolar walls?
What type of epithelium makes up the alveolar walls?
Simple squamous epithelium
How does blood circulation maintain efficient gas exchange?
How does blood circulation maintain efficient gas exchange?
Maintains steep concentration gradients
Why must the gas exchange surface be moist?
Why must the gas exchange surface be moist?
O2 dissolves in water before diffusing
In which direction does oxygen move during gas exchange?
In which direction does oxygen move during gas exchange?
From alveolar air into blood
Where is carbon dioxide concentration higher during gas exchange?
Where is carbon dioxide concentration higher during gas exchange?
In the blood arriving at the lungs