Organs & Structures
This dome-shaped muscle helps with inhalation.
What is the diaphragm?
The process of taking air into the lungs.
What is inhalation?
Gas exchange occurs in these lung structures.
What are alveoli?
A disease where airways narrow and swell, making breathing difficult.
What is asthma?
This lung is slightly smaller due to the heart.
What is the left lung?
These tiny air sacs are the site of gas exchange.
What are alveoli?
This gas is taken into the lungs during breathing.
What is oxygen?
This gas is released from the blood into the alveoli.
What is carbon dioxide?
An infection that causes fluid in the alveoli.
What is pneumonia?
Approximate number of alveoli in your lungs.
What is 300 million?
This tube connects the throat to the bronchi.
What is the trachea?
This term describes the movement of air out of the lungs.
What is exhalation?
The process by which oxygen and carbon dioxide move across membranes.
What is diffusion?
A chronic lung disease often caused by smoking.
What is emphysema?
The respiratory system works closely with this other system to transport gases.
What is the circulatory system?
These branches of the trachea lead into each lung.
What are bronchi?
Muscles between the ribs that help with breathing.
What are intercostal muscles?
These vessels surround alveoli and allow gas exchange.
What are capillaries?
This condition involves chronic obstruction of airflow.
What is COPD (Chronic Obstructive Pulmonary Disease)?
The brain structure that controls breathing rate.
What is the medulla oblongata?
The flap that prevents food from entering the trachea.
What is the epiglottis?
The term for normal breathing rate per minute.
What is 12–20 breaths per minute?
Hemoglobin binds to this gas in red blood cells.
What is oxygen?
This lung cancer risk factor is the leading preventable cause of death.
What is smoking?
The percentage of oxygen in Earth’s atmosphere.
What is about 21%?