Respiratory System Anatomy

Cilia

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Pharynx

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Nose Function

Air enters Hairs trap dirt and pollen

Bood Vessels (Artery and Vein) Function

Artery - Bring blood into lungs/alveoli from heart Vein - Bring blood back from lungs/alveoli to heart

Pharynx Function

Back of the throat Both mouth and nose open here

Esophagus Function

Carries food from the mouth → stomach Peristalsis starts here

Larynx (Voice Box) Function

Contains vocal cords Vibrate to speak or sing

Epiglottis Function

Cover trachea (and larynx) during swallowing Prevents choking

Lung Function

Elastic sacs full of tiny air sacs (alveoli)

Cilia Function

Hair-like structures located in the nasal passages, trachea, and bronchi that remove dust and other particles from the air Clean air

Rib/Chest Muscle Function

Skeletal/Voluntary Muscle Contracts and relaxes to allow breathing

Diaphragm Function

Smooth muscle (mostly involuntary) Contracts and relaxes to allow breathing (Changes size of chest cavity → changes pressure)

Capillaries (net) Function

Surround alveoli and exchange gases between blood and the environment

Bronchi (bronchus) Function

The tubes that carry air from the trachea into each lung Also contain cilia

Alveolus/Alveoli Function

Tiny airs acs (where the action is) Walls are 1-cell thick to exchanges gases with capillaries around them by diffusion Large surface area Make up most of your lungs

Bronchiole Function

Tiny tubes (branches) - branch and cary air all over inside the lungs

Nasal Passages Function

Tubes that are lined with mucus (moisten, clean), cilia (clean), and lots of capillaries (warm) Cleans, warms, and moistens air

Trachea Function

Windpipe Cartilage rings hold it open Lined with cilia to clean air Carries air toward lungs