In a gas, pressure is a force created by the movement of gas molecules that are confined. Inspiration (or inhalation) and expiration (or exhalation) are dependent on the differences in pressure between the atmosphere and the lungs. However, the ability to breathe-to have air enter the lungs during inspiration and air leave the lungs during expiration-is dependent on the air pressure of the atmosphere and the air pressure within the lungs. The alveolar and intrapleural pressures are dependent on certain physical features of the lung. The major mechanisms that drive pulmonary ventilation are atmospheric pressure ( P atm) the air pressure within the alveoli, called alveolar pressure ( P alv) and the pressure within the pleural cavity, called intrapleural pressure ( P ip).

Pulmonary ventilation is the act of breathing, which can be described as the movement of air into and out of the lungs.

Discuss factors that can influence the respiratory rate.

Describe the respiratory centers of the pons.

Describe the respiratory centers of the medulla oblongata.

Outline the mechanisms behind the control of breathing.

Discuss the meaning of respiratory volume and capacities.

Discuss the physical factors related to breathing.List the steps involved in pulmonary ventilation.

Discuss how pressure, volume, and resistance are related.Describe the mechanisms that drive breathing.By the end of this section, you will be able to:

Alveolar dead space, physiology space