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What is true during inhalation?



A. The rib cage moves up and out
B. The diaphragm curves and moves upwards
C. The thoracic cavity becomes smaller
D. Air pressure in the lungs increase

This question is part of Science Form 3 Chapter 1 & 2-Pop Quiz
Asked by Himiko, Last updated: Feb 19, 2020

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2 Answers

V. Barnes

V. Barnes

Answered May 10, 2018

During inhalation, our rib cage moves up and out. The primary organ of our respiration system is lungs. Other components of the respiratory system convey air to the lungs, such as the trachea (the windpipe) which branches into smaller structures called bronchi.

The process of respiration (breathing) is divided into two distinct phases.

• Inspiration (inhalation),
• Expiration (exhalation).

The diaphragm contracts and pulls downward during Inspiration while the muscles between the ribs contract and pull upward. This increases the size of the thoracic cavity and decreases the pressure inside. As a result, air rushes in and fills the lungs. But during Expiration, the diaphragm relaxes, and the volume of the thoracic cavity reduces, while the pressure within it increases. As a result, the lungs contract and air is forced out.

 

himiko

Himiko

Answered Feb 10, 2018

The rib cage moves up and out
 

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