Anatomy of the Respiratory System Respiration Respiration is the act of breathing: Inhaling (inspiration). The act of breathing in oxygen. Exhaling (expiration). The act of breathing out carbon dioxide. Respiratory system The respiratory system is made up of the organs involved in the exchange of oxygen and carbon dioxide. These are the parts: Nose Mouth Throat (pharynx) Voice box (larynx) Windpipe (trachea) Large airways (bronchi) Lungs The upper respiratory tract is made up of the: Nose Nasal cavity Sinuses Larynx Trachea The lower respiratory tract is made up of the: Lungs Bronchi and bronchioles Alveoli (air sacs) Lungs The lungs take in oxygen. The cells of your body need oxygen to live and carry out their normal functions. The lungs also get rid of carbon dioxide, a waste product of the cells. The lungs are a pair of cone-shaped organs made up of spongy, pinkish-gray tissue. They take up most of the space in the chest (thorax). The lungs are surrounded by a membrane (pleura). The lungs are separated from each other by the mediastinum, an area that contains the: Heart and its large vessels Trachea Esophagus Thymus gland Lymph nodes The right lung has 3 sections, called lobes. The left lung has 2 lobes. When you breathe: Air enters your body through your nose or mouth. Air then travels down the throat through the larynx and trachea. Air goes into the lungs through tubes called main-stem bronchi. One main-stem bronchus leads to the right lung and one to the left lung: In the lungs, the main-stem bronchi divide into smaller bronchi. The smaller bronchi divide into even smaller tubes (bronchioles). Bronchioles end in tiny air sacs (alveoli).

Anatomy of the Respiratory System

Respiration

Respiration is the act of breathing:

Inhaling (inspiration). The act of breathing in oxygen.
Exhaling (expiration). The act of breathing out carbon dioxide.

Respiratory system

The respiratory system is made up of the organs involved in the exchange of oxygen and carbon dioxide. These are the parts:

Nose
Mouth
Throat (pharynx)
Voice box (larynx)
Windpipe (trachea)
Large airways (bronchi)
Lungs

The upper respiratory tract is made up of the:

Nose
Nasal cavity
Sinuses
Larynx
Trachea

The lower respiratory tract is made up of the:

Lungs
Bronchi and bronchioles
Alveoli (air sacs)

Lungs

The lungs take in oxygen. The cells of your body need oxygen to live and carry out their normal functions. The lungs also get rid of carbon dioxide, a waste product of the cells.

The lungs are a pair of cone-shaped organs made up of spongy, pinkish-gray tissue. They take up most of the space in the chest (thorax).

The lungs are surrounded by a membrane (pleura).

The lungs are separated from each other by the mediastinum, an area that contains the:

Heart and its large vessels
Trachea
Esophagus
Thymus gland
Lymph nodes

The right lung has 3 sections, called lobes. The left lung has 2 lobes. When you breathe:

Air enters your body through your nose or mouth.
Air then travels down the throat through the larynx and trachea.
Air goes into the lungs through tubes called main-stem bronchi.

One main-stem bronchus leads to the right lung and one to the left lung:

In the lungs, the main-stem bronchi divide into smaller bronchi.
The smaller bronchi divide into even smaller tubes (bronchioles).
Bronchioles end in tiny air sacs (alveoli).