Respiratory System

Parts & Function

Nasal Cavity / Nose

• Organ where air enters the respiratory system

• Nasal Nares – entrance to nasal

cavities

• Mucous lined Cavities– Moisten/Warm Air

• Smell

Pharynx

• Tube that leads air from nose/mouth.

• 3 sections • Nasopharynx

– behind nasal cavities

• oropharynx – back of mouth

• laryngopharynx – bottom of throat.

• Air/Food share

Larynx

• Voice Box• Below the Pharynx. • Made of cartilage

rings.– Vibrate with air to

create sounds – Adam's apple

Epiglottis

• Cartilage flap that covers the larynx opening when swallowing food or water.

• Directs food to esophagus

• Prevents them from entering lungs.

Trachea

• Windpipe• Extends from larynx to bronchi. • Made of sturdy cartilage

Bronchi / Bronchial Tree

• Branches off the Trachea.

• Direct air into lungs.– Primary first branch

that leads into the lung– Secondary are those

that branch off primary, smaller.

– There are 10 Tertiary Bonchi

Lungs

• Large organs where gas exchange is facilitated.

• Divided up into 10 sub-compartments called Lobes,

• Right is smaller due to heart

Parietal Pleura

• The Pleural lining that covers the inside of the chest wall/ribs

Pleural Space• The space between

the Parietal and Visceral Pleura

• Filled with a small amount of fluid

• Reduce Friction

Visceral Pleura

• The Pleural Lining that covers the lungs

Diaphragm

• Smooth Muscle – "engine" for the

respiratory System.

• Causes Inspiration• Dome Shaped. • Separates

Thorasic/Abdominal Cavity.

• Flattens w/ Inspiration

Primary Bronchi

• Right and Left Branches off the Trachea

• Direct Air into the Right and Left Lungs

Bronchioles

• Another Name for Tertiary Bronchi

• They Branch off into the different lobes of the lungs

Respiratory Bronchiole

• Terminal Bronchiole• Directs Air into the Alveolar Ducts/Sacs

Alveolar Ducts

• Smaller tubes that branch off the bronchioles in the lungs.

• Direct gasses into/out of the alveolar sac

Alveoli / Alveolar Sac• Alveolar Sac

– A collection of smaller sacs

– Bunch of Grapes

• Alveoli– Small Sac within the

“bunch”– Lined with Capillaries– Gas Exchange