The respiratory system is...

The system of organs which allows you to inhale and exhale oxygen and carbon dioxide

Smelling, tasting and breathing all start here. Mucous lining and tiny hairs called cilia inside the nose that help prevent foreign objects from entering

The pharynx is shared with the digestive system from the tongue down to the epiglottis (Flap of skin that prevents food from going down the trachea)

1. A passageway for air 2. A valve to close off the air passage from the digestive one (The epiglottis) 3. Voice box

An armoured tube that allows air to pass beyond the larynx to where it divides into the left and right bronchi. The protective c's of the cartilage also provide protection to the esophagus right and beyond.

The lungs are the essential organs of respiration. The main function is to exchange CO2 for the O2 and vice versa. Each lung is enclosed separately within two membranes like a balloon inside a bag.

Trachea branches into a left and right bronchus, each leading to a lung.

Each bronchus divides and subdivides into smaller and smaller branches, the bronchioles, just like branches of a tree.

Tiny air cells or sacs that resemble bunches of grapes. They are the link between the respiratory and circulatory systems. Gas exchange happens here. O2 goes from an alveoli into a blood vessel and CO2 come out of the blood and goes into the alveoli.

This muscular structure acts as a floor to the chest (Thoracic) cavity as well as a roof to the abdominal cavity. It helps to expand and contract the lungs, forcing the air into and out of them.

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Science U2L4

Question	Answer
The respiratory system is...	The system of organs which allows you to inhale and exhale oxygen and carbon dioxide
Nose	Smelling, tasting and breathing all start here. Mucous lining and tiny hairs called cilia inside the nose that help prevent foreign objects from entering
Mouth	Secondary inhaler and exhaler
Pharynx	The pharynx is shared with the digestive system from the tongue down to the epiglottis (Flap of skin that prevents food from going down the trachea)
Larynx	1. A passageway for air 2. A valve to close off the air passage from the digestive one (The epiglottis) 3. Voice box
Trachea	An armoured tube that allows air to pass beyond the larynx to where it divides into the left and right bronchi. The protective c's of the cartilage also provide protection to the esophagus right and beyond.
Lung	The lungs are the essential organs of respiration. The main function is to exchange CO2 for the O2 and vice versa. Each lung is enclosed separately within two membranes like a balloon inside a bag.
Bronchus	Trachea branches into a left and right bronchus, each leading to a lung.
Bronchiole	Each bronchus divides and subdivides into smaller and smaller branches, the bronchioles, just like branches of a tree.
Alveoli	Tiny air cells or sacs that resemble bunches of grapes. They are the link between the respiratory and circulatory systems. Gas exchange happens here. O2 goes from an alveoli into a blood vessel and CO2 come out of the blood and goes into the alveoli.
Diaphragm	This muscular structure acts as a floor to the chest (Thoracic) cavity as well as a roof to the abdominal cavity. It helps to expand and contract the lungs, forcing the air into and out of them.

Created by: MUFU

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