In human respiratory system, when a person breathes in, the position of ribs and diaphragm will be :
In human respiratory system, when a person breathes in, the position of ribs and diaphragm will be :
Options
Official answer
The correct option is B: lifted ribs and flattened diaphragm.
Marking scheme
- 1.Identification of rib movement (lifted ribs) during inhalation (0.5 marks)
- 2.Identification of diaphragm shape (flattened) during inhalation (0.5 marks)
Hint
Think about how you expand your chest to pull air in. The diaphragm must move down (flatten) to create more space.
Quick oral answer
During inhalation, the ribs are lifted up and the diaphragm is flattened to increase the volume of the chest cavity, drawing air into the lungs.
Common mistakes
- 1.Confusing inhalation with exhalation, where the diaphragm relaxes and returns to its dome shape.
Analysis and explanation
During inhalation (breathing in), the body actively expands the thoracic cavity to draw air into the lungs:
- Ribs: The intercostal muscles contract, causing the ribs to move upward and outward (lifted ribs).
- Diaphragm: The diaphragm muscle contracts and moves downward, changing from its relaxed dome shape to a flattened shape.
This combined movement increases the volume of the chest cavity, lowering the air pressure inside the lungs relative to the atmospheric pressure, which forces outside air to rush into the lungs. Therefore, Option B is correct, while options involving relaxed ribs or a dome-shaped diaphragm during inhalation are incorrect.
Interesting facts
The surface area of human lungs is roughly equivalent to the size of a tennis court, optimized for efficient gas exchange!
Question details
Q10 of 39 questions
- Board
- CBSE
- Class
- Class 10
- Subject
- Science
- Year
- 2024
- Section
- Section A
- Marks
- 1
- Type
- MCQ
- Chapter
- Life Processes
- Topic
- Respiration in Human Beings
- Bloom's level
- Remembering
- Syllabus topic
- Respiration - Mechanism of breathing in human beings
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Frequently asked questions
How many marks does this question carry in CBSE Class 10 Science 2024?
This question carries 1 mark in the CBSE Class 10 Science 2024 examination.
Which chapter does this question come from in Science?
This question is from the chapter "Life Processes" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "Respiration in Human Beings" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2024 paper?
This is a MCQ question from Section A in the CBSE Class 10 Science 2024 paper.