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Cardiovascular System
The heart & circulatory system; another name for the circulatory system, which transports materials throughout the body
Circulatory System
the organ system that moves blood through the body
Digestive System
the organ system that breaks down food into nutrients that cells need
Muscular System
muscles that are attached to and move bones
Respiratory System
carries oxygen into lungs, where it is transferred into the blood as well as removes carbon dioxide
Skeletal System
bones that give support and shape to body
Nervous System
brain, spinal cord, and nerves that carry messages and controls senses
Unicellular
An organism made of only one cell that does everything it needs to live (like bacteria).
Multicellular
An organism made of many cells that work together to keep it alive (like plants and animals).
Cell
The smallest unit of life; all living things are made of cells.
Tissue
A group of similar cells that work together to do a job.
Organ
A body part made of different tissues that work together to do a special function (like the heart or leaves).
Organ System
A group of organs that work together to do an important job in the body (like the digestive system).
Organism
A living thing that can carry out all life processes by itself.
Levels of Organization
The way living things are organized: cells → tissues → organs → organ systems → organism.
Human Body – Bone – Bone Cells – Skeletal System – Bone Tissue
Bone Cells-Bone Tissue-Bone-Skeletal System-Human Body
