1. 5 Levels of Organization

2. Multicellular Organisms
Benefits:
Larger sized organism
Longer life span
Specialized cells

3. Structure and Function
Structure is the arrangement of parts in an organism.
Ex. Digestive System
Function is the job the part does.

4. 5 Levels of Organization
Cells
Tissues
Organs
Organ Systems
Organism

5. Cells
Cells are the smallest level of organization in living things.

6. Tissue Cells work together to form Tissue.
There are 4 types of tissue in your body:
Connective (bone, blood)
Nerve
Epithelial (skin, linings)
Muscle

7. Organ
Tissues work together to perform a job form an Organ.

8. Organ System Organs work together to form an Organ System
You have 11 organ systems in your body.

9. Organism
All systems work together to form the organism. .

10. Organ Systems Integumentary system facts:
Skin is the largest organ in your body.
Skin is 16% of your body weight
You completely replace your skin cells about once per month.
About 90% of dust in your house is dead skin cells.
Hair is the fastest growing organ in the body
Average #s of hairs:
redheads= 80,000
Brown/black = 100,000
Blondes = 120,000
Fingernails grow faster during the summer and on your dominant hand.

11. Organ Systems 2- Muscular system The muscular system allows us to move
Biceps, triceps, hamstring, and quadriceps, are all organs in the muscular system.

12. Organ Systems 3- Skeletal system
The skeletal system provides support and protection for vital organs.
Bones, ligaments, and tendons are some organs that make up a skeletal system.

13. Organ Systems 4- Nervous system
The nervous system sends messages that control body functions
The brain, spinal cord, and nerves are some organs in the nervous system.

14. Organ Systems 5- Endocrine System
The endocrine system produces chemicals that control the body (ex. Hormones)
The adrenal glands, pituitary gland (in brain), thyroid, and pancreas are all organs in the endocrine system.

15. Organ Systems 6- Cardiovascular system (circulatory)
The cardiovascular system carries food and oxygen to the cells, and carries carbon dioxide away from the cells.
Your heart, arteries, veins, and capillaries, are organs in the cardiovascular system.

16. Organ Systems 7- Lymphatic system
(Immune system)
The lymphatic system returns leaked fluids to blood vessels, and helps fight off germs.
Lymph nodes, lymph vessels, thymus, spleen, and tonsils are all organs in the lymphatic system.

17. Organ Systems 8- Respiratory system
The respiratory system exchanges oxygen for carbon dioxide. (O2 in and CO2 out).
Lungs, Bronchi, trachea, and diaphragm are all organs in the respiratory system.

18. Organ Systems 9- Digestive System
The digestive system breaks food down into nutrients that can be absorbed by the body.
The mouth, liver, stomach, and intestines are some of the organs in the digestive system.

19. Organ Systems 10- Urinary System (excretory)
The urinary system removes waste from the blood and regulates body fluids.
Kidneys, ureters, and the bladder are all organs in the urinary system.

20. Organ Systems 11- Reproductive system
The reproductive system enables the organism to produce offspring
Ovaries and uterus in a female and testes in a male are organs in the reproductive system.

21. Quiz time!
Which level of organization do each of the following pictures belong to?

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