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"3 Organ systems" are far too few. You have:

Respiratory System: Deals with oxygen intake and carbon dioxide removal.

Digestive System: Ingestion, digestion, and absorbtion of nutrients.

Excretory System: Removal of nitrogenous wastes from the body. (AKA urine)

Lymphatic System: Deals with the return of fluids(lymph) into the blood stream.

Circulatory System: Deals with the movement of blood throughout the body in order to supply O(2) to the various parts.

Nervous System: Deals with response to stimulus and controls the other systems.

Reproductive System: Deals with the procreation of the species.

Exocrine System: Deals with the release of enzymes/hormones via ducts.

Endocrine System: Release of enzymes/hormones directly into the blood stream.

Skeletal System: Structural support system.

Muscular System: Movement and function.

Integumentary System: Protection of the body from outside objects. Includes hair and nails.

I may be missing one or two, but this is most of them.

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12y ago

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