repirtory system

Respiratory system

Functions in gas exchange with external environment

Circulatory system

Moves gases and other substances throughout the body

What does bronchus branch out to

Bronchioles

What do bronchioles branch out into to

Alveolar ducts

What do alveolar ducts terminate into

Alveoli

Alveoli

Multitude of small sacs

Site of gas exchange

Lined by simple squamous epithelium which is lined by capillaries

Bronchioles

Carries air into and out of alveoli

Bigger ones are supported by hyaline cartilage

Has small layer of smooth muscle that expand and contract

Nares

Openings to nasal cavity

Allows air to pass from nose to pharynx

Larynx

Portion I’d respiratory tract contains vocal cords allows sounds

Trachea

Windpipe

Tube that allows air to pass from pharynx to lungs

Bronchi

Two tubes carrying air from trachea to right and left lungs (plural: bronchus)

Lungs

Major organ of respiratory system with extensive internal surfaces for gas exchange with the blood