Chapter: 05. Human Respiratory System
Section A: Multiple Choice Questions (5 Marks)
Choose the best answer for each question.
Which of these is the main respiratory organ in humans?
a) Heart
b) Stomach
c) Lungs
d) Brain What gas do we take in more of when we inhale?
a) Carbon dioxide
b) Oxygen
c) Nitrogen
d) Methane The part of the respiratory system also known as the ‘voice box’ is the:
a) Pharynx
b) Trachea
c) Larynx
d) Bronchi During inhalation, what happens to the diaphragm?
a) It moves upwards
b) It moves downwards and flattens
c) It stays still
d) It relaxes Which of these diseases is caused by bacteria and affects the alveoli in the lungs?
a) Asthma
b) Bronchitis
c) Pneumonia
d) Tuberculosis Section B: Fill in the Blanks (6 Marks)
Complete the sentences with the correct word(s).
The process of taking in oxygen, breaking down food, and releasing energy is called _ _ _ _ _ _ _ _ _ _ _ _ _ _ _. Air is filtered, warmed, and moistened in the _ _ _ _ _ _ _ _ _ _ _ _ _ _ _. The windpipe is also known as the _ _ _ _ _ _ _ _ _ _ _ _ _ _ _. Tiny air sacs at the end of the bronchioles where gas exchange occurs are called _ _ _ _ _ _ _ _ _ _ _ _ _ _ _. Breathing is a _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ process, while respiration is a _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ process. Oxygen combines with _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ in the blood to form oxyhaemoglobin. Section C: True/False Questions (5 Marks)
Write ‘True’ if the statement is correct and ‘False’ if it is incorrect.
Respiration is a mechanical process. The epiglottis closes when we swallow food to prevent it from entering the trachea. Exhaled air contains more oxygen than inhaled air. Tuberculosis is a viral disease. Bronchial tubes become inflamed in bronchitis. Section D: Explanations of Terms (4 Marks)
Explain the following terms in one or two sentences.
Section E: Short Answer Questions (9 Marks)
Answer the following questions in 2-3 sentences.
List two functions of the nasal passages. What is the purpose of the C-shaped rings of cartilage in the trachea? Why does our breathing rate increase during fast running or heavy exercise? How does the composition of inhaled air differ from exhaled air regarding oxygen and carbon dioxide? Mention two common symptoms of Asthma. Section F: Diagram-Based Question (4 Marks)
The illustration depicts the main parts of the human respiratory system.
Identify the parts labeled
Section G: Differentiate Concepts (6 Marks)
Differentiate between the following concepts.
Breathing and Respiration (in terms of process type and main outcome) External Respiration and Internal Respiration (in terms of location of gas exchange) Section H: Long Answer Questions (6 Marks)
Answer the following questions in 4-5 sentences.
Explain the mechanism of breathing in humans, detailing what happens during both inhalation and exhalation. Describe the role of the lungs, specifically the alveoli, in the process of gas exchange within the human body. 
Practice Paper
