Interpreting Chest X-Rays: Diaphragm and Pleura

What is the primary function of the pleura in the respiratory system?

• To facilitate the exchange of gases

• To protect the lungs from infection

• To reduce friction between the lungs and chest wall during breathing

• To supply blood to the lung tissue

Which muscle plays a crucial role in the process of inhalation?

• Intercostal muscle

• Diaphragm

• Pectoralis major

• Abdominal muscle

Inhalation occurs when the diaphragm:

• Contracts and moves downward

• Relaxes and moves upward

• Stays in a neutral position

• Expands outward

The left lung has three lobes and the right lung has two. 

• True
• False

Chronic Obstructive Pulmonary Disease (COPD) is mainly caused by:

• Bacterial infections

• Genetic factors

• Long-term exposure to lung irritants

• High altitudes

What is pneumothorax?

• Inflammation of the pleura

• Collection of blood in the pleural space

• Air within the pleural space

• Fluid in the pleural space

How is the size of a pneumothorax determined on an x-ray?

• By the thickness of the rim of air around the lung at the hilum level

• By the presence of lung markings

• By the volume of air in the pleural space

• By the patient's symptoms

What does an expiratory film show in a patient with pneumothorax?

• Increased lung volume

• Decreased contrast between lung and pleural air

• Pneumothorax becomes harder to identify

• Pneumothorax appears wider

What is a pleural effusion?

• Thickening of the pleura

• A type of lung cancer

• Collection of fluid in the pleural space

• Air in the pleural space

How can pleural effusions be identified on an x-ray?

• By a sharp meniscus on the PA film

• By the presence of lung markings

• By a blunting of the costophrenic angle

• By the size of the lung