Our lungs breathe in air through a process called inhalation. When we inhale, the muscles around our lungs, especially the diaphragm, contract and expand the chest cavity. This expansion creates a vacuum, causing air to flow in through our nose or mouth, down the trachea, and into our lungs to fill the space.
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MCQs
1. What do we call the process of taking air into the lungs?
A) Digestion
B) Inhalation
C) Photosynthesis
D) Exhalation
Answer: B) Inhalation
Explanation: Inhalation is the process of taking air into the lungs. It is the first part of the breathing process.
2. What happens to the diaphragm when you inhale?
A) It relaxes and moves up
B) It contracts and moves down
C) It stays still
D) It disappears
Answer: B) It contracts and moves down
Explanation: When you inhale, the diaphragm contracts and moves downward to make space for the lungs to expand and fill with air.
3. Which part of your body helps you to breathe?
A) Heart
B) Lungs
C) Stomach
D) Brain
Answer: B) Lungs
Explanation: Your lungs are the primary organs responsible for breathing. They take in oxygen and release carbon dioxide.
4. What is the name of the tiny air sacs in the lungs where oxygen is exchanged with carbon dioxide in the blood?
A) Ventricles
B) Alveoli
C) Arteries
D) Veins
Answer: B) Alveoli
Explanation: Alveoli are tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide occurs.
5. What muscle separates the chest cavity from the abdominal cavity and plays a major role in breathing?
A) Biceps
B) Heart
C) Diaphragm
D) Spine
Answer: C) Diaphragm
Explanation: The diaphragm is a large, dome-shaped muscle that separates the chest cavity from the abdominal cavity and plays a crucial role in breathing.
6. What do we call the tiny hairs inside the nose that help filter out dust and germs?
A) Cilia
B) Fingers
C) Whiskers
D) Spikes
Answer: A) Cilia
Explanation: Cilia are tiny hairs inside the nose that help filter out dust, germs, and other particles from the air we breathe.
7. What is the main purpose of breathing?
A) To eat
B) To sleep
C) To get oxygen into the body
D) To listen
Answer: C) To get oxygen into the body
Explanation: The primary role of breathing is to absorb oxygen and to expel carbon dioxide through the movement of the lungs. Muscles that control the movement of the lungs are the diaphragm (a sheet of muscle underneath the lungs) and the muscles between the ribs.
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