Respiratory System Flashcards
Respiratory System
Inhale oxygen into lungs, exhale carbon dioxide
Respiration
Process of supplying oxygen to cells and removing carbon dioxide from them
Inspiration
Inhalation
Expiration
Exhalation
Ventilation
Inhaling and exhaling
Upper respiratory tract
Nose, nasal cavaties, pharynx, larynx
Lower respiratory tract
Trachea, bronchi, bronchioles, alveoli
Pharynx
Throat
Larynx
Contains vocal cords
Epiglottis
Flap over larynx that prevents food and liquids from entering airways during swallowing, and opens during inhalation to let air into trachea
Trachea
Windpipe. Divides at lower end into right and left bronchus
Bronchus
Divided into left and right lung. Divides into smaller branches called bronchioles
Bronchioles
Small “branches” that end with tiny air sacs called alveoli
Alveoli
Look like a “cluster of grapes.” Composed of very thin membrane. Are surrounded by large numbers of capillaries. They exchange oxygen and carbon dioxide with these capillaries.
Capillaries
Blood in capillaries pick up oxygen from alveoli and carry it to the left side of the heart (and then it is pumped through the body). Alveoli pick up carbon dioxide from capillaries and it is expelled through exhalation.