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Respiratory System Basics

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Questions and Answers

What is the relationship between pressure and volume according to Boyle's Law?

Constantly equal

Directly proportional

Inversely proportional (correct)

Unrelated

What happens to the pressure in the thoracic cavity during expiration?

It becomes zero

It decreases

It increases (correct)

It remains constant

What is the primary force involved in exhalation during quiet breathing?

Active muscular force

Negative pressure

Gravity

Passive elastic recoil (correct)

What is the purpose of the diaphragm and external intercostal muscles contracting during quiet inhalation?

To create a negative pressure, allowing air to flow into the lungs Signup and view all the answers

Why does air rush out of the lungs during expiration?

To equalize pressure Signup and view all the answers

What is required for speech and singing?

Constant subglottal pressure Signup and view all the answers

What is the primary mechanism of exhalation during speech production?

Combination of passive and active expiratory forces Signup and view all the answers

What is the ideal lung volume for speech breathing, according to the relaxation pressure curve?

Medium lung volume (20-70% of vital capacity) Signup and view all the answers

What is the minimum subglottal pressure required to set vocal folds into vibration?

7cm water pressure Signup and view all the answers

What happens to subglottal pressure at high levels of vital capacity?

Subglottal pressure increases Signup and view all the answers

What is the significance of the 37% vital capacity cutoff on the relaxation pressure curve?

It marks the transition from active to passive forces Signup and view all the answers

What is the term for the total amount of air that can be exhaled from the lungs after maximum inhalation?

Vital capacity Signup and view all the answers