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The heart and blood vessels (arteries, capillaries, and veins) are called the cardiovascular system. The cardiovascular system carries blood throughout the body. The heart pumps blood through blood vessels called "arteries" and then through smaller blood vessels called "capillaries" to each organ and tissue in the body.

The skin that covers your body is called the dermal system. The skin is the barrier that protects the body from hazardous substances in the environment. Also, skin helps keep the body from losing electrolytes and fluids.

The blood cells (erythrocytes, granulocytes, and platelets) and the tissues that form them ((bone marrow, spleen, and lymph nodes) make up the hematological system. Blood carries oxygen, nutrients, and hormones to cells throughout the body. Also, it keeps the blood vessels open, helps the immunological system function (see immunological below), and removes waste and carbon dioxide from body cells.

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Phthalates are a group of aromatic chemicals containing a phenyl ring with two attached and extended acetate groups. They are typically colorless liquids used to make plastics more flexible and resilient, and are often referred to as plasticizers. Because they are not a part of the chain of chemicals (polymers) that makes up plastics, they can be released fairly easily from these products.

Phenols are a group of aromatic chemicals containing one phenyl ring with an attached hydroxyl group. They are colorless-to-white solids with a sickly sweet odor. Phenols are used to make plastics and as a disinfectant in both household cleaning products and consumer products, such as mouthwashes.

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Medical Education and Training

Persons using assistive technology might not be able to fully access information in this file. For assistance, please send e-mail to: mmwrq@cdc.gov.

Persons using assistive technology might not be able to fully access information in this file. For assistance, please send e-mail to: mmwrq@cdc.gov.

For the 57 million Americans with disabilities, medical emergencies and natural disasters present real challenges. Learn how people with disabilities, their families, and first responders can plan ahead for a disaster.

Persons using assistive technology might not be able to fully access information in this file. For assistance, please send e-mail to: mmwrq@cdc.gov.

Report of Human Infection with Swine Origin Influenza A (H3N2) - CDC

CDC Says U.S. Seeing Latest Flu Season in Nearly Three Decades.