The opening in the face through which food and drink enter the body, and air is breathed in and out. It also contains the tongue, teeth, and other structures involved in chewing and speaking.

The part of the face that contains the nostrils and is the primary organ for breathing. It filters, warms, and moistens the air as it is breathed in.

A tube-shaped structure that connects the larynx (voice box) to the bronchi, allowing air to pass to and from the lungs. It is also known as the windpipe.

The two branches of the trachea that lead to the lungs. They are the main airways for breathing, and they become smaller and smaller as they divide into smaller tubes, called bronchioles.

A muscle located at the bottom of the chest that helps us breathe by contracting and relaxing to move air in and out of our lungs.

Small, balloon-like sacs in the lungs where gas exchange occurs. Oxygen is taken in through the walls of the alveoli and carbon dioxide is released from the blood into the alveoli to be breathed out.

The main organs of the respiratory system. They are located in the chest and are responsible for breathing, including gas exchange.

A gas that is essential for life. It is breathed in through the lungs and used by cells in the body to produce energy.

A waste gas produced by cells in the body. It is breathed out through the lungs and expelled from the body.

The system of organs and tissues involved in breathing, including the lungs, trachea, bronchi, and other structures involved in breathing and gas exchange. It is responsible for taking in oxygen and expelling carbon dioxide.