How do cells work together?

1. How do cells work together?

3. Tissue

4. Tissues are the next level of organization above cells. • There are four types of tissues in the human body: epithelial tissue, connective tissue,muscle tissue and nerve tissue.

5. Epithelial tissue • Epithelial tissue contains cells that are packed tightly together. Your outer layer of skin is epithelial tissue, The lining of your air passage is, too.

6. Epithelial tissue • Epithelial tissue lines your internal organs , helping them to carry out their functions while protecting the other tissues in the organ.

7. Connective tissue • Connective tissue adds support and structure to the body, fills spaces and stores fat.

8. Connective tissue Blood, bones, cartilage and fat cells all form connective tissue.

9. Muscle tissue • Muscle tissue is like elastic, its job is to contract and relax. • Skeletal muscles move the bones of the skeleton when directed by the brain to do so. (voulantary muscles).

10. Muscle tissue • Smooth muscle does invoulantary movement such as breathing. • Smooth muscles make up most of the walls of the body organs, Including blood vessels and digestive system.

11. Smooth muscles

12. Muscle tissue • cardiac muscles contract to move blood around the body.

13. Muscle tissue

14. Nerve tissue • Nerve tissue is found in the brain ,the spinal cord and the nerves. • Nerves send messages to the brain and the spinal cord.

16. Organs • An organ is a structure made up of at least two types of tissues that work together to form a specific job in the body.

17. organ

18. Organ system