The nose serves as the main entrance for air into the respiratory system.

It filters, warms, and moisturizes the incoming air.

The nose is made up of cartilage and bone, with two nostrils that lead into the nasal cavity.

The nasal cavity contains cilia and mucus to trap particles and prevent them from entering further into the respiratory system.

The pharynx, also known as the throat, is a muscular tube located behind the nasal cavity and mouth.

It serves as a passage for both air and food.

It plays a role in speech production.

The larynx, or voice box, is a tube-like structure located below the pharynx.

It is composed of cartilage and contains vocal cords.

The larynx is responsible for sound production and voice modulation.

It prevents the entry of food and other substances into the lower respiratory system.

The trachea, also known as the windpipe, is a long tube made of cartilage rings.

It connects the larynx to the bronchi.

It serves as a passageway for air to enter and exit the lungs.

The bronchi are two branches that arise from the trachea and lead into each lung.

They distribute air from the trachea into the lungs.

They play a role in the filtration of foreign particles through the presence of cilia and mucus.

The lungs are two spongy organs located in the chest cavity.

They are protected by the ribcage and surrounded by a double-layered membrane called the pleura.

The lungs are the main organs of gas exchange.

They facilitate the transfer of oxygen from inhaled air to the bloodstream and the removal of carbon dioxide from the bloodstream.

The diaphragm is a dome-shaped muscle located at the base of the lungs.

It plays a crucial role in the process of breathing, contracting and relaxing to change the volume of the chest cavity.

It helps draw air into the lungs during inhalation and expel air during exhalation.

During inhalation, the diaphragm contracts, flattens, and moves downward.

This increases the volume of the chest cavity and decreases the pressure within the lungs.

Air rushes in through the nose and mouth, travels through the pharynx, larynx, trachea, and bronchi, and finally reaches the lungs.

During exhalation, the diaphragm relaxes and moves upward, reducing the volume of the chest cavity.

This increases the pressure within the lungs, causing air to be pushed out through the respiratory passageways.

In the lungs, oxygen diffuses from the alveoli (tiny air sacs) into the surrounding capillaries, binding to hemoglobin in red blood cells.

This oxygenated blood is then transported to various tissues and organs in the body.

As cells carry out cellular respiration, carbon dioxide is produced as a waste product.

Carbon dioxide diffuses from the tissues into the capillaries and binds to hemoglobin for transport back to the lungs.

In the lungs, carbon dioxide is released into the alveoli and expelled during exhalation.