1. Identifying cells, tissues, organs, and organ systems,

2. Cells  A structural unit of all living things. The smallest unit classified as an living organism.

3. Tissues  Tissues are an ensemble of cells, they are not the same but the are of the same origin, that carries out an function.  A bunch of cells that work together

4. Organs  Organs are groups of tissue that perform different functions. There are many organs in the body like skin, kidney, liver, and etc.

5. Organ Systems Some types of organ systems are, Circulatory, Respiratory, Digestive, Nervous, and Reproductive.

6. Digestive System  breaks down proteins, fats and all carbohydrates into smaller molecules, which can then be absorbed along with vitamins and minerals

8. Respiratory  Absorbs oxygen from the air and excretes the waste product carbon dioxide to the air.

10. Circulatory system  distributes nutrients and oxygen to all body cells plus hormones to target cells, carries waste products to the organs of excretion (kidneys, lungs), toxins to the liver for detoxification and also helps fight infections through its white blood cells

12. Skeletal system  It supports the body and protects it. It is also what all the are muscles attached to, without that you couldn't use them.

13. Muscular system  The main purpose of the muscular system is to provide movement for the body. The muscular system consists of mucles

14. Urinary System  Remove wastes from the body.  Regulate levels of electrolytes in the body.  Regulate hydration of the body.  Maintain acid-base balance of the body.  Maintain blood pressure.

15. Nervous System   To provide communication in the body, sensations, thoughts, emotions, memories and controls your reactions.

16. How do the organ systems work together?  distributes the above nutrients and oxygen to all body cells plus hormones to target cells, carries waste products to the organs of excretion (kidneys, lungs), toxins to the liver for detoxification and also helps fight infections through its white blood cells