Class 8 Exam > Class 8 Questions > Air can enter and leave the lungs because ...... Start Learning for Free
Air can enter and leave the lungs because .......
- a)of pressure changes
- b)the volume of the thorax (chest) remains the same
- c)there is gas exchange
- d)there is no pressure change
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Air can enter and leave the lungs because .......a)of pressure changes...
Explain the mechanism of breathing
Answer: (a) of pressure changes
Air moves into and out of the lungs through the process of breathing, which relies entirely on pressure differences between the lungs and the atmosphere.
Inspiration (breathing in): The diaphragm and intercostal muscles contract, increasing the volume of the chest cavity. This increase in volume causes the pressure inside the lungs to decrease below atmospheric pressure, leading to air flowing in.
Expiration (breathing out): These muscles relax, decreasing the volume of the chest cavity. This reduction in volume increases the pressure inside the lungs above atmospheric pressure, forcing air out.
The chest cavity is airtight, which allows these pressure changes to be effective in moving air. Air always flows down its pressure gradient, from an area of higher pressure to an area of lower pressure.
Answer: (a) of pressure changes
Air moves into and out of the lungs through the process of breathing, which relies entirely on pressure differences between the lungs and the atmosphere.
Inspiration (breathing in): The diaphragm and intercostal muscles contract, increasing the volume of the chest cavity. This increase in volume causes the pressure inside the lungs to decrease below atmospheric pressure, leading to air flowing in.
Expiration (breathing out): These muscles relax, decreasing the volume of the chest cavity. This reduction in volume increases the pressure inside the lungs above atmospheric pressure, forcing air out.
The chest cavity is airtight, which allows these pressure changes to be effective in moving air. Air always flows down its pressure gradient, from an area of higher pressure to an area of lower pressure.
Free Test
FREE
| Start Free Test |
Community Answer
Air can enter and leave the lungs because .......a)of pressure changes...
The animal uses its chest muscles to increase the volume of its lungs. The air inside the lungs is therefore more spread out than before, so it has a lower pressure. The higher pressure of the air outside of the lungs forces air into the lungs. The opposite is true of breathing out.
 | Explore Courses for Class 8 exam |  |
Top Courses for Class 8View all
Top Courses for Class 8
Question Description
Air can enter and leave the lungs because .......a)of pressure changesb)the volume of the thorax (chest) remains the samec)there is gas exchanged)there is no pressure changeCorrect answer is option 'A'. Can you explain this answer? for Class 8 2026 is part of Class 8 preparation. The Question and answers have been prepared according to the Class 8 exam syllabus. Information about Air can enter and leave the lungs because .......a)of pressure changesb)the volume of the thorax (chest) remains the samec)there is gas exchanged)there is no pressure changeCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 8 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Air can enter and leave the lungs because .......a)of pressure changesb)the volume of the thorax (chest) remains the samec)there is gas exchanged)there is no pressure changeCorrect answer is option 'A'. Can you explain this answer?.
Air can enter and leave the lungs because .......a)of pressure changesb)the volume of the thorax (chest) remains the samec)there is gas exchanged)there is no pressure changeCorrect answer is option 'A'. Can you explain this answer? for Class 8 2026 is part of Class 8 preparation. The Question and answers have been prepared according to the Class 8 exam syllabus. Information about Air can enter and leave the lungs because .......a)of pressure changesb)the volume of the thorax (chest) remains the samec)there is gas exchanged)there is no pressure changeCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 8 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Air can enter and leave the lungs because .......a)of pressure changesb)the volume of the thorax (chest) remains the samec)there is gas exchanged)there is no pressure changeCorrect answer is option 'A'. Can you explain this answer?.
Solutions for Air can enter and leave the lungs because .......a)of pressure changesb)the volume of the thorax (chest) remains the samec)there is gas exchanged)there is no pressure changeCorrect answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 8. Download more important topics, notes, lectures and mock test series for Class 8 Exam by signing up for free.
Here you can find the meaning of Air can enter and leave the lungs because .......a)of pressure changesb)the volume of the thorax (chest) remains the samec)there is gas exchanged)there is no pressure changeCorrect answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of Air can enter and leave the lungs because .......a)of pressure changesb)the volume of the thorax (chest) remains the samec)there is gas exchanged)there is no pressure changeCorrect answer is option 'A'. Can you explain this answer?, a detailed solution for Air can enter and leave the lungs because .......a)of pressure changesb)the volume of the thorax (chest) remains the samec)there is gas exchanged)there is no pressure changeCorrect answer is option 'A'. Can you explain this answer? has been provided alongside types of Air can enter and leave the lungs because .......a)of pressure changesb)the volume of the thorax (chest) remains the samec)there is gas exchanged)there is no pressure changeCorrect answer is option 'A'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice Air can enter and leave the lungs because .......a)of pressure changesb)the volume of the thorax (chest) remains the samec)there is gas exchanged)there is no pressure changeCorrect answer is option 'A'. Can you explain this answer? tests, examples and also practice Class 8 tests.
| Explore Courses for Class 8 exam | |
Top Courses for Class 8
Explore Courses
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
