Glossary

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biosafety (bye-oh-SAYF-tee) Biosafety is safety relating to biological research. CDC labs have biosafety numbers that indicate the safety measures that should be used in each lab.
bioterrorism (bye-oh-TER-urism) Bioterrorism is the use of a virus or other agent to hurt or kill others. CDC workers are trained to fight bioterrorism.
microbes (MYE-krobes) Microbes are organisms that are too small to be seen without a microscope. CDC scientists have to be careful when studying microbes that are select agents.
mutate (MYOOT-ate) To mutate is to change into something different. Viruses can mutate so that they are resistant to treatment.
outbreaks (OUT-brakes) Outbreaks are a sudden start or increase in something. Disease outbreaks occur when many people suddenly develop a disease.
select agents (si-LEKT AYjuhnts) Select agents are organisms that can cause a disease. The CDC works with select agents in its laboratories.
alveoli (al-VEE-oh-lye) Alveoli are the small balloonlike sacs in the lungs. Gases are exchanged in the alveoli.
bronchioles (brahng-KEE-uhlz) Bronchioles are smaller tubes that branch off of the right bronchus and left bronchus in the lungs. Alveoli are found at the end of the bronchioles.
bronchus (brahng-KUS) The right bronchus and left bronchus are tubes that branch off of the trachea. They help bring air to the lungs.
carbon dioxide (KAHR-buhn dye-AHK-side) Carbon dioxide is a gas found in the air. The lungs remove carbon dioxide from the body when you exhale.
diaphragm (DYE-uh-fram) The diaphragm is the wall of muscle below the chest. The diaphragm helps pull air into your lungs and push it back out.
exhale (eks-HALE) To exhale means to push air out of the lungs. Carbon dioxide is carried out of your body when you exhale.
inhale (in-HAYL) To inhale means to bring air into the lungs. Oxygen is carried into your lungs and body when you inhale.
lobes (lohbz) The lungs are divided into different sections called lobes. The left lung has two lobes, and the right lung has three.
oxygen (AHK-si-juhn) Oxygen is a gas with no color in the air and water. Humans need oxygen to live.
respiratory system (RES-pur-uhtor- ee sis-tuhm) The respiratory system is the body system that supplies oxygen to the body and removes carbon dioxide. The nose, lungs, diaphragm, trachea, and right and left bronchus are all parts of the respiratory system.
trachea (tray-KEE-a) The trachea is also called the windpipe. The trachea is the main tube air passes through to get to the lungs.
expand (ek-SPAND) To expand is to increase in size, range, or amount. Muscles help expand the lungs.
inflate (in-FLATE) To inflate is to add air or gas to something and make it larger. Gases fill the lungs and inflate the alveoli.
passages (PASS-uh-jez) Passages are long, narrow spaces that connect one place to another. Air flows through passages in the body.