18 Questions
What enables maximum oxygen absorption in mammals during gas exchange?
Large surface area and thin diffusion pathway
What is the function of the trachea in the mammalian gaseous exchange system?
To warm, humidify and filter the air we breathe
Where does gas exchange occur in the mammalian respiratory system?
In the alveoli
What is the importance of a steep concentration gradient in the alveoli?
It increases oxygen absorption
What is the benefit of a large surface area in the alveoli?
It increases the rate of oxygen absorption
What is the role of blood supply in the alveoli?
It increases the rate of oxygen absorption
What is the main function of the ciliated epithelial cells in the trachea?
To move mucus up to the back of the throat to be swallowed
What is the main difference between the bronchi and the bronchioles?
Bronchi have cartilage rings, while bronchioles do not
What is the primary function of the goblet cells in the trachea?
To produce mucus that traps dust particles and bacteria
What is the main function of the smooth muscle in the bronchioles?
To allow constriction to restrict air flow
What is the main function of the trachea in the mammalian gaseous exchange system?
To carry air to the bronchi
What is the primary gaseous exchange surface in humans?
Alveoli
What is the primary site of gaseous exchange in humans?
Alveoli
What is the characteristic of the walls of the alveoli?
One cell thick
What is the direction of oxygen diffusion in the alveoli?
From alveoli into blood
What is the approximate number of alveoli in each lung?
300 million
What happens to the concentration of carbon dioxide in the alveoli during expiration?
It decreases
What maintains the steep concentration gradient of oxygen in the alveoli?
Good blood supply
Test your knowledge on how mammals are adapted for gas exchange, including the role of alveoli in maximizing oxygen absorption. This quiz covers Topic 9 of CAIE Biology A-level. Prepare for your exams with these flashcards!
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