Any living thing, like a plant, animal, or tiny microbe, that can grow, use energy, and respond to its environment. It can be as small as a single cell or many cells.

The smallest unit of structure and function in living things. In multicelled organisms, cells are specialized.

Unicellular means made of only one cell. A unicellular organism, like bacteria or some algae, does everything it needs to live with just that single cell.

Multicellular means made of many cells. In multicellular organisms, like plants and animals, different cells work together to keep the organism alive.

Tissue is a group of similar cells that work together to do a specific job in a living thing, like muscle tissue that helps you move.

Organ is a structure made of different tissues working together to do a specific job.

Body system is a group of organs that work together to carry out major functions of the body, like the digestive system breaking down food.

Specialized cells are cells that have a specific shape and job, like red blood cells carrying oxygen or nerve cells sending signals.

Nerve cells that carry messages around the body.

Changes in the environment that you can sense, like light, sound, or heat, and they cause an organism to respond.

How an organism reacts to a stimulus. Responses can be physical, like moving away from danger, or chemical/inside the body, like releasing hormones or increasing heart rate.

Part of a cell or organ that detects stimuli, like your eyes detecting light or your skin sensing touch.

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Structure & Function

Term	Definition
organsim	Any living thing, like a plant, animal, or tiny microbe, that can grow, use energy, and respond to its environment. It can be as small as a single cell or many cells.
cell	The smallest unit of structure and function in living things. In multicelled organisms, cells are specialized.
unicellular	Unicellular means made of only one cell. A unicellular organism, like bacteria or some algae, does everything it needs to live with just that single cell.
multicellular	Multicellular means made of many cells. In multicellular organisms, like plants and animals, different cells work together to keep the organism alive.
tissue	Tissue is a group of similar cells that work together to do a specific job in a living thing, like muscle tissue that helps you move.
organ	Organ is a structure made of different tissues working together to do a specific job.
body system	Body system is a group of organs that work together to carry out major functions of the body, like the digestive system breaking down food.
specialized cells	Specialized cells are cells that have a specific shape and job, like red blood cells carrying oxygen or nerve cells sending signals.
neurons	Nerve cells that carry messages around the body.
stimulus	Changes in the environment that you can sense, like light, sound, or heat, and they cause an organism to respond.
response	How an organism reacts to a stimulus. Responses can be physical, like moving away from danger, or chemical/inside the body, like releasing hormones or increasing heart rate.
receptor	Part of a cell or organ that detects stimuli, like your eyes detecting light or your skin sensing touch.

Created by: user-1807182

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