Science

Diffusion

The movement of molecules from an area of high concentration to an area of low concentration.

Alveoli

Tiny air sacs in the lungs where gas exchange occurs.

Cellular Respiration

The process by which cells use oxygen to produce energy from glucose.

Excretory System

The system responsible for removing waste products from the body.

Compounds

Substances made of two or more different types of atoms that are chemically joined together.

Mixtures

A combination of two or more substances that are not chemically bonded and retain their individual properties.

Heart Chambers

The four sections of the heart: Right Atrium, Right Ventricle, Left Atrium, Left Ventricle.

Capillaries

Microscopic, one-cell-thick blood vessels where diffusion occurs.

Chemical Change

A process that involves rearranging atoms to create new substances with different properties.

Physical Change

A change that alters the form or appearance of a substance but does not change its chemical composition.

Arteries

Blood vessels that carry blood away from the heart.

Veins

Blood vessels that carry blood back to the heart.

Kidneys

Organs that filter blood and remove waste products to form urine.

Chemical Bonding

The process of atoms joining together chemically to form compounds.

Urea

A toxic waste product produced by cells that is filtered out by the kidneys.

Gas Exchange

The process of oxygen entering the blood and carbon dioxide exiting the blood, primarily occurring in the alveoli.