Respiration and Gas Exchange

The pleura is a double-layered serous membrane that encloses and protects the lungs, reducing friction during breathing.

The lungs are the primary organs of the respiratory system where oxygen is taken in and carbon dioxide is released into the blood.

Bronchioles terminate in tiny, grape-like clusters called alveoli, which are the sites of gas exchange between the air and the blood.

A cough is a reflex action to clear the airways of mucus or irritants by a sudden, forceful release of air from the lungs through the mouth.

The human respiratory system includes the trachea, bronchi, and lungs, all of which work together to facilitate gas exchange.

The trachea is reinforced by C-shaped rings of hyaline cartilage, which prevent the airway from collapsing during inhalation. Other structures like alveoli are too small for such rings.

The trachea is the main airway leading from the larynx to the bronchi. It is commonly referred to as the windpipe.

The trachea bifurcates into two primary bronchi, which lead into the left and right lungs. These tubes further branch into smaller airways.

The pleura is a double-layered serous membrane that surrounds each lung. It reduces friction during breathing movements.

The diaphragm is a dome-shaped muscle that separates the thoracic cavity from the abdominal cavity. It is the primary muscle involved in respiration.

The rib cage is a bony structure that protects the heart and lungs. It is composed of the ribs, sternum, and thoracic vertebrae.

Inside the lungs, the bronchi branch into smaller and smaller tubes known as bronchioles. These eventually lead to the alveoli.

Alveoli are tiny, pouch-like air sacs at the end of the bronchioles. They are the site of gas exchange between the air and the blood.

The walls of the alveoli are extremely thin and are surrounded by a dense network of pulmonary capillaries to facilitate efficient gas exchange.