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Mechanics of Respiration Introduction

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Questions and Answers

According to Boyle's law, what happens to the pressure within the lungs as the volume increases during inspiration?

The pressure increases to facilitate inspiration.

The pressure remains constant.

The pressure decreases to facilitate inspiration. (correct)

The pressure first increases and then decreases.

What is the typical range of the intrathoracic (intrapleural) pressure during the respiratory cycle?

-10 to -12.5 cmH2O

-5 to -7.5 cmH2O (correct)

-2.5 to -5 cmH2O

-7.5 to -10 cmH2O

What is the relationship between alveolar pressure and pleural pressure during respiration?

Alveolar pressure is always greater than pleural pressure.

Alveolar pressure is greater than pleural pressure during inspiration and less during expiration. (correct)

Alveolar pressure is equal to pleural pressure.

Alveolar pressure is always less than pleural pressure.

What is the primary purpose of the negative intrathoracic (intrapleural) pressure?

To keep the lungs inflated against the chest wall. Signup and view all the answers

Which of the following correctly describes the relationship between respiratory rate and normal breathing?

Normal respiratory rate is about 12 breaths per minute. Signup and view all the answers

Which of the following processes is involved in the exchange of gases between the body and the atmosphere during respiration?

Both inspiration (inhalation) and expiration (exhalation). Signup and view all the answers

What is the approximate percentage of total body energy utilized during the respiratory process?

3% Signup and view all the answers

Which of the following muscles is NOT involved in forced inspiration?

Internal intercostal Signup and view all the answers

What is the normal value for total compliance of the lungs and chest wall?

0.1 L/cmH2O Signup and view all the answers

Which of the following is NOT a characteristic of compliance?

Is directly proportional to the elastic recoil of the lung Signup and view all the answers

What is the typical cause of diaphragm paralysis?

Lesion or injury to the phrenic nerve Signup and view all the answers

What is the relationship between the compliance of the lungs and the chest wall?

They work paradoxically, so total compliance is less than the sum of the two Signup and view all the answers