Respiratory System

Filters, warms and moistens air Prevents debris from entering lungs

Region from the nasal cavity to the trachea

Stops food from going into the lungs And ensures air enters the lungs

It contains vocal cords (it’s the voice box) Joins pharynx and trachea

Made of C shaped cartilage to ensure its always open Lined with a mucus membrane that traps debris and pushes it up to the pharynx to be swallowed via cilia

Holds the lungs against the inside of the chest wall Allows lungs to slide while breathing

Move ribcage up and out to increase volume of chest cavity during inspiration

Contracts and flattens to increase chest cavity and allow the lungs to expand during inspiration

1 cell thick Large surface area Rich blood supply Located deep within the body Constant exchange of air

Air flows in&out the alveoli as we breathe Pulmonary artery brings deoxygenated blood to the capillaries around alveoli CO2 diffuses into alveoli and O2 diffuses out Oxygenated blood taken to the heart via pulmonary veins

Infection of the lungs caused by bacteria or viruses Surface area available for gas exchange is reduced

An allergic response to foreign substances that enter the body Due to narrowed airway (inflammation of mucus blocking airway)