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Biology for IGCSE & O level - Gas Exchange In Humans (Section 5)

1
What is the main function of the diaphragm?
Answer
(C)
To control the volume of the chest cavity
2
What is the function of the alveoli?
Answer
(C)
To exchange gases
3
Which of the following is a direct result of the contraction of the diaphragm?
Answer
(A)
The lungs expanding.
4
What happens to the volume of lungs during exhalation?
Answer
(B)
The volume decreases.
5
What part of the respiratory system branches into the bronchioles?
Answer
(C)
Bronchi
6
Which part of the respiratory tract does air pass through immediately before entering the lungs?
Answer
(A)
Trachea
7
What happens to the air pressure in the lungs during inhalation?
Answer
(B)
The pressure decreases.
8
What process(es) does the respiratory system facilitate? (Select all that apply)
Answer
A
D
9
In which area does the gas exchange happen?
Answer
(B)
Alveoli
10
What is the function of the cartilage rings in the trachea?
Answer
(C)
To keep the airway open
11
What is the role of the lungs in respiration?
Answer
(C)
To exchange gases
12
What is the main function of the bronchi?
Answer
(C)
To transport air to the lungs
13
The exchange of gases in the lungs happens at the ______.
Answer
(C)
Alveoli
14
What is the function of surfactant in the alveoli?
Answer
(C)
To reduce surface tension.
15
What controls the rate and depth of breathing?
Answer
(B)
The brain
16
What is the primary function of the alveoli in the lungs?
Answer
(B)
To facilitate gas exchange
17
Which part of the respiratory system is most responsible for removing carbon dioxide from the blood?
Answer
(B)
Alveoli
18
Which of the following is the site of gas exchange?
Answer
(C)
Alveolus
19
Which of the following is NOT a function of the respiratory system?
Answer
(D)
Digestion
20
What is the role of the intercostal muscles during breathing?
Answer
(B)
They move the rib cage, changing the volume of the chest cavity.
21
What are the two main components of the brain that control breathing?
Answer
(B)
Medulla Oblongata and Pons