FAST FACTS

Deaths From Smoking



Each year cigarette smoking accounts for approximately 1 of every 5 deaths, or about 443,000 people. Cigarette smoking results in 5.1 million years of potential life lost in the United States annually. (CDC)

Body Systems
Circulatory System

The human circulatory system is composed of blood, blood vessels, and the heart. There are three types of blood vessels, which differ in structure and function. The heart serves as the pump for circulating blood around the body. Blood is...

Digestive System

If human cells could use the food eaten in its original form, there would be no need for a digestive system. The digestive system changes the food into a form that the cells can use and that enables the nutrients to get into the blood so they can...

Endocrine System

The endocrine system is probably the least understood body system. Chemicals secreted by the glands of this system have effects on numerous organs of multiple systems and control or regulate various mechanisms of every other body....

Excretory System

The excretory system is responsible for eliminating the waste products produced by metabolic functions in the body. It is absolutely essential to good health that these waste products do not build up in the tissues or blood, where...

Integumentary System

The skin is the largest organ of the body and is composed of two layers—the epidermis (outer layer) and the dermis (inner layer). The epidermis is a thin layer of cells and forms a protective layer over the inner dermis. It prevents...

Muscular System

The muscular system allows us to move. Adults have a certain fixed number of muscle cells, approximately 602. Through exercise, such as weightlifting, the cells enlarge but the number of cells does not....

Nervous System

The nervous system allows for sensing, response, and control. Response by the nervous system is accomplished by motor control. (Contrast this response with the chemical control used by the endocrine system.)
How does the nervous ...

Reproductive System

The human reproductive system allows for the production of offspring and the continuation of the species. Males and females have distinct reproductive organs and glands, which form gametes (sperm in males, eggs...

Respiratory System

When you think of respiration, you probably think of breathing. The two processes are not the same. Breathing involves getting air in and out of your body–inhalation and exhalation. Respiration involves getting the oxygen that you breathe...

Skeletal System

The adult human skeletal system has 206 bones that provide support, protection, and shape to the body. It also has other important but lesser known functions that allow the body to store minerals, make blood cells, and grow...