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Name: _____________________________

The Path of Air in the Respiratory System

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Mouth/Nose

• ________ help to keep the air _______.• ________ help keep the air _________. • ___________ help keep the air ______.

________ also sweeps _________ into the throat so you can swallow allowing the __________________ to destroy the bacteria and dust.

Cilia cleanMucus moistCapillaries warm

Cilia Mucus

Stomach acid

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Pharynx

• The _________ is the only part of the ______________ system that is shared with other system -- the ___________________ system.

• It is also called the ______________.

pharynxrespiratory

digestive

throat

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Larynx

• The _________ is located in the top part of the ____________.

• It is also called the ____________________.• Two ____________________, which are folds of

______________ tissue that produce your _______, stretch across the opening the larynx.

• The _______________ of the vocal cords makes the air molecules _____________ creating a sound, your __________.

• ________ vocal cords produce a _______ voice.• ________ vocal cords produce a _______ voice.

larynxtrachea

voiceboxvocal cords

connective voice

movementvibrate

voiceLong deepShort high

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Trachea

• The ____________ is also called the windpipe.• ____________ helps strengthen and keep it open.• It is also lined with __________ and __________.• When your trachea is irritated, you __________.• ________ should only enter the trachea. • If food enters the trachea, it can ________ air from

entering the lungs and you will _____________.• The ________________ is a flap of tissue that seals

the trachea when you ________________.

tracheaCartilage

cilia mucuscough

Airblock

chokeepiglottis

swallow

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Bronchi and Bronchioles

• _________ direct _______ into the lungs.• _______________ is when the bronchial

tubes become irritated, swell up, and are clogged with _________, which makes you _______.

• __________ damages the ___________ in your respiratory system. This can permanently damage your lungs because ____________ can build up, causing infections.

Bronchi air

Bronchitis

mucuscough

Smoking cilia

bacteria

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Alveoli

• __________ move __________ from the ______ into the _________________.

• They also remove ______________ from the blood.

• The walls of the alveoli and capillaries are ____________, which means substances can easily pass through them easily.

• The huge ____________________ of the alveoli allows the lungs to ___________ a large amount of _____________.

Alveoli

oxygen

air bloodstreamCarbon dioxide

permeable

surface areaabsorb

oxygen