The diaphragm

The diaphragm is the chief muscle of respiration and is a dome-shaped muscular partition that separates the thoracic cavity from the abdominal cavity. During contraction the diaphragm is pulled down creating a vacuum in the chest cavity which sucks air into the lungs. Relaxation of the

Air passes through the larynx, which is sometimes known as the voice box. Sound is produced by passing air over the vocal cords in the larynx

The trachea is a large, flexible but strong tube also known as the windpipe. Rings of cartilage maintain its shape.

Air passes through the larynx, which is sometimes known as the voice box. Sound is produced by passing air over the vocal cords in the larynx

The trachea is a large, flexible but strong tube also known as the windpipe. Rings of cartilage maintain its shape.

At the top of the throat is a flap of skin, the epiglottis, which prevents food or other particles entering the lungs.

The trachea branches into two to enter the lungs as bronchi

The bronchus in each lung divides into bronchioles

Air is taken into the body through the mouth and nasal cavity. In the nostrils, the air is filtered by tiny hairs (cilia), warmed, and moistened by mucus

At the top of the throat is a flap of skin, the epiglottis, which prevents food or other particles entering the lungs.

The trachea branches into two to enter the lungs as bronchi

The bronchus in each lung divides into bronchioles

The alveoli are covered with very small capillaries, which allow oxygen and carbon dioxide to pass into and out of the blood stream

Bronchioles sub-divide into small air sacs, alveoli. Most of the lung tissue is made up of millions of alveoli, which is where the exchange of oxygen into the blood and carbon dioxide out of the blood occurs

Fig 7.2 The respiratory system diaphragm causes it to rise, allowing the lungs to deflate and air is pushed out of the lungs as a result.

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