The Respiratory System

Function The main function of the Respiratory System is to get oxygen into the bloodstream and get carbon dioxide out of the bloodstream. Oxygen is needed by your body for respiration (converting glucose into energy). The main function of the Respiratory System is to get oxygen into the bloodstream and get carbon dioxide out of the bloodstream. Oxygen is needed by your body for respiration (converting glucose into energy).

The Nose and Mouth Air enters the Respiratory System primarily through the nose, but can also enter through the mouth. Tiny hairs, called cillia, which filters the air as it passes through. Mucus also helps filter and moisten the air. Air enters the Respiratory System primarily through the nose, but can also enter through the mouth. Tiny hairs, called cillia, which filters the air as it passes through. Mucus also helps filter and moisten the air.

The Trachea and Bronchi Air then enters into the trachea, which is a tube leading from the mouth to the lungs. The epiglottis (a flap of tissue at the back of the throat) closes off the trachea when you swallow to keep food from entering. Air flows from the trachea to the two bronchi, each leading to one of the two lungs. Air then enters into the trachea, which is a tube leading from the mouth to the lungs. The epiglottis (a flap of tissue at the back of the throat) closes off the trachea when you swallow to keep food from entering. Air flows from the trachea to the two bronchi, each leading to one of the two lungs.

The Pharynx and Larynx The first section of the trachea is known as the pharynx and leads to the larynx, which contains your vocal cords. The first section of the trachea is known as the pharynx and leads to the larynx, which contains your vocal cords.

Trachea and Bronchi

The Lungs The bronchi branch off into smaller and smaller branches called bronchioles. The bronchioles are surrounded by the lungs, which are sack-like organs made of spongy tissue. They can inflate and deflate like a balloon. The bronchi branch off into smaller and smaller branches called bronchioles. The bronchioles are surrounded by the lungs, which are sack-like organs made of spongy tissue. They can inflate and deflate like a balloon.

The Lungs

The Alveoli At the end of each bronchiole are tiny air sacs called alveoli. Each alveolus is surrounded by blood vessels. Oxygen moves into the bloodstream, while carbon dioxide moves from the blood into the alveoli. The oxygen is carried by the blood to all parts of your body, while the carbon dioxide is exhaled from your body. At the end of each bronchiole are tiny air sacs called alveoli. Each alveolus is surrounded by blood vessels. Oxygen moves into the bloodstream, while carbon dioxide moves from the blood into the alveoli. The oxygen is carried by the blood to all parts of your body, while the carbon dioxide is exhaled from your body.

The Alveoli

The Diaphragm Air can enter and exit the lungs by the action of the diaphragm, which is a long muscle at the base of the rib cage. When this muscle contracts (inhaling), air rushes in because a lower pressure is created inside your lungs. When it relaxes, air is forced out (exhaling). Air can enter and exit the lungs by the action of the diaphragm, which is a long muscle at the base of the rib cage. When this muscle contracts (inhaling), air rushes in because a lower pressure is created inside your lungs. When it relaxes, air is forced out (exhaling).

Breathing

Review! 1. alveoliA. tiny hairs 2. ciliaB. throat 3. larynxC. nose 4. nasal cavityD. windpipe 5. pharynxE. voice box 6. tracheaF. air sacs esource.html esource.html