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Respiratory System Anatomy and Function

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Questions and Answers

What is the main function of the lungs?

to store oxygen for future use
to facilitate gas exchange (correct)
to filter out dust and bacteria from the air
to regulate body temperature

How many lobes do the lungs consist of?

two in the right lung and one in the left
five lobes in both lungs
three in the right lung and two in the left (correct)
four in the right lung and two in the left

What is the protective membrane surrounding the lungs called?

thoracic membrane
respiratory membrane
pleural membrane (correct)
pulmonary membrane

During inhalation, what happens to the chest cavity?

it increases in size (A) Signup and view all the answers

What happens to the air pressure inside the lungs during exhalation?

it increases (A) Signup and view all the answers

What is responsible for the contraction and relaxation of the diaphragm and intercostal muscles?

respiratory muscles (C) Signup and view all the answers

In which part of the lungs does gas exchange occur?

Alveoli (D) Signup and view all the answers

What is the primary function of the respiratory system?

To facilitate the exchange of gases between the body and the external environment (C) Signup and view all the answers

What is the primary force that allows oxygen to move from the alveoli into the bloodstream?

Concentration gradient (C) Signup and view all the answers

What is the thickness of the alveolar-capillary membrane?

0.5 micrometers (D) Signup and view all the answers

Why does oxygen diffuse readily across the alveolar-capillary membrane?

Because it is highly soluble (A) Signup and view all the answers

What happens to carbon dioxide during gas exchange?

It is exhaled out of the body (A) Signup and view all the answers