An organism’s ability to maintain steady internal conditions when outside conditions change.

A group of organs that work together to break down food into substances that your cells can use and to eliminate solid waste.

The physical process of breaking down food into smaller pieces so that it can be more easily digested chemically.

The process where large food molecules, like carbohydrates, proteins, and fats, are broken down into smaller, absorbable molecules by digestive enzymes, primarily occurring in the mouth, stomach, and small intestine, allowing the body to utilize nutrients from food.

A protein that speeds up chemical reactions.

A part of food used by the body to grow and survive.

A group of organs that work together to supply the blood with oxygen and expel carbon dioxide from the body.

A group of organs that work together to transport blood around your body to deliver nutrients to and take waste products away from each of your body’s cells.

The system of the body’s defenses made up of the cells, tissues, and organs that fight pathogens in the body. The immune system’s main function is to protect the body from pathogens.

An agent that causes diseases like bacteria, viruses, or other types of microorganisms.

The system that works together to protect from foreign and environmental substances and acts as a physical barrier to protect underlying cells and tissues.

The system that collects extracellular fluid from tissue and returns it to the blood and fights infections.

The system that contains bones as well as other structures that connect and protect the bones and that supports other functions.

The system that contains tissues that are responsible for providing movement and temperature regulation.

The system that gathers, processes, and responds to information.

The system of glands throughout the body that regulate body functions.

The organs and structures that make it possible to produce offspring.