Human Respiratory System

Front

Pharynx

Back

the membrane-lined cavity behind the nose and mouth, connecting them to the esophagus.

Front

Larynx

Back

voice box; passageway for air moving from pharynx to trachea; contains vocal cords.

Front

Trachea

Back

a large membranous tube reinforced by rings of cartilage, extending from the larynx to the bronchial tubes and conveying air to and from the lungs; the windpipe.

Front

Epiglottis

Back

A flap of tissue that seals off the windpipe and prevents food from entering.

Front

Nasal cavity

Back

hollow space behind the nose.

Front

Bronchus (bronchi)

Back

branch of the trachea (windpipe) that is a passageway into the lung; bronchial tube.

Front

Bronchioles

Back

Airways in the lungs that lead from the bronchi to the alveoli.

Front

Alveolus

Back

tiny air sac at the end of a bronchiole in the lungs that provides surface area for gas exchange to occur.

Front

Diaphragm

Back

Large, flat muscle at the bottom of the chest cavity that helps with breathing.

Front

Pleural Membrane/Pleura

Back

A thin layer of tissue that lines the pleural cavity, the space that surrounds the lungs and lies underneath the chest wall.