Pulmonary Ventilation

Front

What is pulmonary ventilation?

Back

Pulmonary ventilation is the process of moving air in and out of the lungs, allowing for gas exchange between the atmosphere and the alveoli.

Front

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

Back

During inspiration, there is a decrease in pressure in the thoracic cavity, which allows air to flow into the lungs.

Front

What is the atmospheric pressure at sea level?

Back

The atmospheric pressure at sea level is 760 mm of Hg.

Front

State Boyle's Law in relation to gas pressure and volume.

Back

According to Boyle's Law, the pressure exerted by a gas decreases as the volume of space it occupies increases, provided its temperature remains constant.

Front

What occurs to the diaphragm during expiration?

Back

During expiration, the diaphragm moves up, reducing the volume of the thoracic cavity and increasing the pressure, which pushes air out of the lungs.

Front

What is the relationship between lung pressure and atmospheric pressure during inhalation?

Back

When air pressure inside the lungs is less than the air pressure in the atmosphere, air moves into the lungs.

Front

Define tidal volume.

Back

Tidal volume is the amount of air that is inhaled or exhaled during normal breathing.

Front

What is the role of the intercostal muscles during breathing?

Back

The intercostal muscles assist in expanding and contracting the thoracic cavity during inhalation and exhalation.

Front

Explain the concept of negative pressure breathing.

Back

Negative pressure breathing is a mechanism where the pressure in the thoracic cavity is reduced below atmospheric pressure, causing air to flow into the lungs.

Front

What is the significance of the alveoli in pulmonary ventilation?

Back

Alveoli are tiny air sacs in the lungs where gas exchange occurs; they increase the surface area for oxygen and carbon dioxide exchange.