Site Glossary

A group of diseases involving abnormal cells that grow and divide uncontrollably.

A tiny blood vessel where nutrients such as glucose and amino acids enter the bloodstream.

A nutrient that provides the body's main source of energy.

A waste gas produced during cellular respiration.

A substance or exposure that can increase cancer risk.

Muscle tissue found only in the heart that contracts involuntarily.

a positively charged ion formed by losing electrons.

a natural object in space, such as a planet, moon, star, or asteroid.

The smallest unit of life that carries out all life processes.

The series of stages through which a cell grows, copies its DNA and divides.