The Body's Organ Systems and Their Major Functions

Forms the external body covering, and protects deeper tissues from injury. Synthesizes vitamin D, and houses cutaneous (pain, pressure, etc.) receptors and sweat and oil glands

Protects and supports body organs, and provides a framework the muscles use to cause movement. Blood cells are formed within the bones. Bones store minerals.

Allows manipulation of the environment , locomotion, and facial expression. Maintains posture, and produces heat.

As the fast-acting control system of the body, it responds to internal and external changes by activating appropriate muscles and glands.

Glands secrete hormone that regulate processes such as growth, reproduction, and nutrient use (metabolism) by body cells.

Blood vessels transport blood, which carries oxygen, carbon dioxide, nutrients, wastes, etc. The heart pumps the blood

Picks up fluid leaked from blood vessels and returns it to blood. Disposes of debris in the lymphatic stream