HC LANG Respiratory Quiz: Introduction, Anatomy, and Structures

External Respiration

Gas exchange between the lungs and the blood

Steps of External Respiration

Inhaled O2 moves from the alveoli into pulmonary capillaries, carbon dioxide moves from pulmonary capillaries into alveoli to be exhaled

Internal Respiration

Gas exchange between the blood and the tissues

Steps of Internal Respiration and Where it Occurs

Oxygen leaves systemic capillaries to enter tissue cells, carbon dioxide leaves tissue cells and enters systemic capillaries

Mediastinum

Central compartment of the thoracic cavity between the lungs. Contains heart, great vessels, trachea and esophagus

Bronchi

The large airways that break off of the trachea into two tube structures

Hilum

Root of lungs where bronchi, pulmonary arteries, pulmonary veins, lymphatics and nerves enter and exit

Respiratory Structures that Conduct Air

Nose, nasal cavities and paranasal sinuses, pharynx, larynx, trachea

Respiratory Structures that Exchange Gases

Bronchioles, alveoli, lung capillaries