Respiration and Gas Exchange

The diaphragm is a dome-shaped muscle located at the base of the chest cavity that contracts and relaxes to facilitate breathing. The ribcage protects the lungs but is made of bone, not muscle.

The trachea is the main airway that leads from the pharynx down into the lungs. The esophagus is the passage for food, not air.

The trachea divides into two main tubes called bronchi, which then branch further into the lungs to deliver air. Alveoli are the tiny air sacs at the end of the bronchioles.

Mucus is a sticky secretion produced by the mucous membranes in the respiratory tract, which traps dust, pollen, and other particles to keep the airways clean.

The lower respiratory tract includes the trachea, bronchi, bronchioles, and the lungs, which contain the alveoli where gas exchange occurs.

Intercostal muscles are located between the ribs and play a crucial role in expanding and contracting the chest cavity during breathing.

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.