Integumentary System Nervous System Circulatory System Digestive System Respiratory System your body. 1. The system that carries oxygen, water, and nutrients to cells throughout 2. It regulates activities that are automatic or voluntary 3. It absorbs water and nutrients from the food you eat 4. It takes in oxygen from the air and also gets rid of carbon dioxide 5. The system that comprises the skin and its appendages acting to protect the body from various kinds of damage.