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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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During inhalation _______.

  1. a. the thoracic cavity expands
  2. b. the diaphragm relaxes
  3. c. atmospheric pressure declines
  4. d. the glottis is closed

Summary Introduction

Concept introduction: Inhalation is the process of taking air into the lungs. And exhalation is the process of expelling air out of the lungs. For inhalation to occur, the air pressure inside the lungs must be lower than that of the external atmosphere (as the air flows from areas of higher pressure to the areas of lower pressure). The thoracic cavity protects the lungs in addition to other organs, tissues, nerves, and cardiovascular vessels.  

Explanation

Reason for the correct answer:

The thoracic cavity has a slight negative pressure that helps in keeping the airways of the lungs open. It increases in size and the volume of the lungs expands during inhalation. The thoracic cavity contracts during the time of exhalation.

Option a. is given as “the thoracic cavity expands”. As the thoracic cavity does expand during inhalation, option a. is correct.

Reasons for the incorrect answers:

Option b. is given as “the diaphragm expands”.

At the time of inhalation, the diaphragm flattens or contracts and allows the lungs to expand...

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