Digestive System - Breakdown and absorption of food., Respiratory System - Gas exchange., Circulatory System - Transports oxygen to cells., Skeletal System - Gives body shape. Protects organs., Nervous System - Sensory and Response., Endocrine System - Releasing hormones to maintain balance., Integumentary System - Protects the body. First line of defense., Muscular System - Contract to provide movement., Excretory System - Removing waste from blood.,

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