Understanding Breathing Mechanics

What happens to the pressure in the lungs during inspiration?

• The pressure in the lungs decreases during inspiration.

• The pressure in the lungs fluctuates randomly during inspiration.

• The pressure in the lungs increases during inspiration.

• The pressure in the lungs remains constant during inspiration.

Which muscle contracts to help with inhalation?

• Intercostal muscles

• Abdominal muscles

• Pectoral muscles

• Diaphragm

What direction does the rib cage move during inspiration?

• The rib cage moves only downward.

• The rib cage moves downward and inward.

• The rib cage remains stationary.

• The rib cage moves upward and outward.

What shape does the diaphragm take during expiration?

• The diaphragm expands outward during expiration.

• The diaphragm flattens during expiration.

• The diaphragm remains flat during expiration.

• The diaphragm takes a dome shape during expiration.

How does the pressure in the lungs change during expiration?

• The pressure in the lungs fluctuates randomly during expiration.

• The pressure in the lungs increases during expiration.

• The pressure in the lungs remains constant during expiration.

• The pressure in the lungs decreases during expiration.

What happens to the diaphragm when it relaxes?

• The diaphragm contracts, leading to increased lung volume.

• The diaphragm remains stationary, having no effect on breathing.

• The diaphragm moves downward, causing inhalation.

• The diaphragm moves upward, causing exhalation.

What is the effect of the rib cage during expiration?

• The rib cage expands, allowing more air to enter the lungs.

• The rib cage remains unchanged, having no effect on air expulsion.

• The rib cage increases in volume, trapping air in the lungs.

• The rib cage decreases in volume, aiding in expelling air from the lungs.

What is the primary function of the diaphragm in breathing?

• The primary function of the diaphragm in breathing is to facilitate inhalation and exhalation by changing the volume of the thoracic cavity.

• To produce sound during speech.

• To filter air pollutants before they enter the lungs.

• To store oxygen for later use.

During which phase does air rush into the lungs?

• Inhalation

• Exhalation

• Holding breath

• Breathing out

What occurs to the rib cage when the diaphragm descends?

• The rib cage elevates.

• The rib cage contracts.

• The rib cage expands.

• The rib cage remains unchanged.