Sign In

Biology for IGCSE & O level - Gas Exchange In Humans (Section 3)

1
What happens to the air pressure in the lungs during exhalation?
Answer
(A)
It increases.
2
What is vital capacity?
Answer
(B)
The maximum amount of air a person can inhale and exhale.
3
What happens to the diaphragm during inhalation?
Answer
(C)
Contracts and moves downwards
4
Which gas is present in higher concentration in exhaled air compared to inhaled air?
Answer
(B)
Carbon dioxide
5
What are the small sacs within the lungs called where gas exchange occurs?
Answer
(C)
Alveoli
6
During exercise, which of the following is likely to occur? (Select all that apply)
Answer
A
C
7
What is the primary function of the capillaries in the lungs?
Answer
(B)
To facilitate gas exchange
8
Which gas is removed from the body during exhalation?
Answer
(C)
Carbon Dioxide
9
What is the approximate percentage of oxygen in inhaled air?
Answer
(B)
21%
10
Which of the following are functions of the nose? (Select all that apply)
Answer
A
B
C
11
Which of the following are components of exhaled air? (Select all that apply)
Answer
B
C
D
12
Which part of the respiratory system is responsible for warming the air?
Answer
(B)
The nose
13
During which process does the diaphragm contract?
Answer
(B)
Inhalation
14
Which of the following events occurs during inhalation?
Answer
(C)
The volume of the chest cavity increases
15
During which process does the rib cage move upwards?
Answer
(B)
Inhalation
16
Which of the following is NOT a part of the respiratory system?
Answer
(B)
Heart
17
What is the name of the muscle that helps in breathing?
Answer
(C)
Diaphragm
18
What is the function of the bronchioles?
Answer
(B)
To transport air to the alveoli
19
Which of the following best describes the role of the bronchi in the respiratory system?
Answer
(C)
To transport air to and from the alveoli.
20
What is the purpose of mucus in the respiratory system?
Answer
(B)
To trap particles
21
Which part of the respiratory system is responsible for producing sound?
Answer
(C)
The larynx
22
What would you expect to see in the lungs of someone who has been exercising? (Select all that apply)
Answer
A
B
23
Where does gas exchange occur in the lungs?
Answer
(C)
Alveoli
24
What is the name of the structure that connects the trachea and the lungs?
Answer
(C)
Bronchi
25
What is the relationship between breathing rate and carbon dioxide levels in the blood?
Answer
(B)
As carbon dioxide levels increase, breathing rate increases.
26
Which of the following structures is/are responsible for the movement of the rib cage during breathing? (Select all that apply)
Answer
(B)
Intercostal muscles
27
Which structure is responsible for filtering, warming, and humidifying the air we breathe?
Answer
(C)
Nose
28
Where is the concentration of oxygen highest?
Answer
(A)
In the alveoli
29
What is the main function of the trachea?
Answer
(C)
To carry air to the lungs
30
Which gas is more abundant in exhaled air than inhaled air?
Answer
(C)
Carbon Dioxide
31
What is the function of the cilia in the respiratory tract?
Answer
(B)
To trap and remove particles
32
Which of the following structures is NOT part of the gas exchange system?
Answer
(C)
Diaphragm
33
Which part of the respiratory system is responsible for the production of sound?
Answer
(B)
Larynx
34
What happens to the volume and pressure in the lungs during exhalation?
Answer
(C)
Volume decreases, pressure increases
35
What happens to the ribcage during inhalation?
Answer
(B)
Moves up and out
36
What is the purpose of the mucus produced in the respiratory tract?
Answer
(C)
To trap and remove particles
37
What happens to the air pressure inside the lungs during inhalation?
Answer
(B)
It decreases.
38
What is the role of the diaphragm in the breathing process?
Answer
(C)
To control the volume of the chest cavity
39
What are the main functions of the lungs? (Select all that apply)
Answer
(A)
Exchanging gases
40
Which of the following is a function of the intercostal muscles?
Answer
(B)
To move the rib cage
41
Which of the following factors affects the depth of breathing?
Answer
(D)
All of the above
42
What is the main function of the bronchioles?
Answer
(B)
To carry air to the alveoli
43
What is the relationship between breathing rate and metabolic rate?
Answer
(D)
As metabolic rate increases, breathing rate increases.
44
Which part of the respiratory system prevents food from entering the lungs?
Answer
(B)
Epiglottis
45
What factors increase the efficiency of gas exchange in the lungs? (Select all that apply)
Answer
A
C
D
46
Where is the trachea located?
Answer
(B)
In the throat
47
What is the role of mucus in the respiratory system?
Answer
(B)
To trap pathogens and debris.
48
Which part of the respiratory system helps filter the air?
Answer
(D)
The nose
49
What happens to the muscles of the rib cage during exhalation?
Answer
(C)
Relax, allowing the ribs to move down and in.
50
Which of the following components of inhaled air is not found in significant quantities in exhaled air?
Answer
(A)
Oxygen