Pleura

Definition

The pleura is a double-layered membrane surrounding the lungs and lining the chest cavity. It provides lubrication and reduces friction during breathing movements.

5 Must Know Facts For Your Next Test

1. The pleura consists of two layers: the visceral pleura (which covers the lungs) and the parietal pleura (which lines the chest cavity).
2. The space between these two layers is called the pleural cavity, which contains a small amount of lubricating fluid.
3. Pleural fluid reduces friction between the lung surfaces and chest wall during respiration.
4. Inflammation of the pleura, known as pleuritis or pleurisy, can cause sharp chest pain that worsens with breathing.
5. The negative pressure within the pleural cavity helps keep the lungs inflated.

Review Questions

• What are the two layers of the pleura, and what do they cover?
• What is the role of pleural fluid in respiration?
• What condition results from inflammation of the pleura?

Related terms

Alveoli: Tiny air sacs in the lungs where gas exchange occurs.

Diaphragm: A dome-shaped muscle that plays a crucial role in breathing by contracting and relaxing to alter thoracic volume.

Bronchi:

The main passageways directly attached to the lungs that divide into smaller bronchioles.