1. Lesson 5 - Levels of Organization
The 5 levels of organization
1st Level--Cells
2nd Level--Cells make up
tissues
3rd Level--Tissues make up
organs
4th Level--Organs make up
organ systems
5th Level--Organ systems
make up the
organism!

2. Let’s put these 5 levels together.
Level 1 – Cells (Heart)
Level 2 – Tissues (Veins,
Arteries, Capillaries)
>
Level 3 – Organs (Heart)
Level 5 – Organism (You)
Level 4-Organ System
(Circulatory System)
>

3. 1. Epithelial 2. Connective 3. Muscle 4. Nervous
4 types of Human Tissue
1. Epithelial
2. Connective
3. Muscle
4. Nervous

4. 1st- Epithelial Tissue Closely packed cells that cover body
surfaces and the
Internal structures.
Examples-
Skin and blood vessels

5. 2nd – Connective Tissue Has many different forms and functions
Examples:
Bone, Fat,
Cartilage, Blood

6. 3rd – Muscle Tissue Contracts to allow movement. Examples:
Heart, Biceps,
Tongue

7. 4th – Nervous Tissue
Transmits and processes information.
Examples:
Spinal Cord,
Brain, Nerves

8. The Organ Systems of the Human Body
7. Skeletal
1. Respiratory
8. Reproductive
2. Circulatory
aka--Cardiovascular
9. Endocrine
3. Nervous
10. Immune
4. Digestive
aka--Lymphatic
5. Urinary
11. Integumentary
aka--Excretory
6. Muscular

9. 1st Body System - Respiratory
Organs – Mouth, nose,
pharynx, larynx, trachea,
bronchi, lungs
Function –
Provides oxygen
to the body’s cells for
Cellular respiration;
removes Carbon dioxide
as waste from the body.

10. 2nd Body System - Circulatory
Aka: Cardiovascular
Organs – Heart, blood,
blood vessels
Function –
Carries oxygen and food to the cells and carbon dioxide away from the cells as
waste; fights infection.

11. 3rd Body System - Nervous
Organs – Brain, spinal
cord, peripheral
nerves, sense organs
Function –
Organizes the body’s
response to stimuli,
or changes
in its internal or
external
environment.

12. 4th Body System - Digestive
Organs – Mouth, pharynx,
esophagus, stomach,
small and large intestines.
Function –
Breaks down food into smaller particles that can be used by the body’s cells for energy.

13. 5th Body System – Urinary
Aka: Excretory
Organs – Skin, lungs,
kidneys, Ureters,
urinary bladders, urethra
Function –
Removes waste from
the body.

14. 6th Body System - Muscular
Organs – Skeletal
muscles,
smooth muscles,
heart (cardiac)
Function –
Works with skeletal
system to produce
movement.

15. 7th Body System - Reproductive
Organs – Male:
Produces and
delivers sperm.
Female: Produces eggs
and nourishes and
shelters the
unborn baby.

16. 8th Body System - Skeletal
Organs – Bones,
cartilage, ligaments,
tendons
Function – Supports
the body and
protects
internal organs.

17. 9th Body System - Endocrine
Organs – Pancreas,
ovaries (in females),
testes (in males),
hypothalamus,
pituitary, thyroid,
adrenal glands
Function – Controls
growth, development,
metabolism, and
reproduction.
HORMONES!!

18. 10th Body System - Immune Works with the Lymphatic system
Organs – White blood
cells, thymus,
spleen, lymph nodes,
lymph vessels.
Function – Protects
the body
from disease.

19. 11th Body System - Integumentary
Organs – Skin, hair,
nails, sweat
and oil glands.
Function – Acts as a
barrier against
infection and injury.

20. Discussion Question
Identify an activity you were involved in recently. Then describe how at least three of your organ systems cooperated to make the activity possible.
Which of the following is not a level of organization in the human body?
A. Organelle C. Tissue
B. Cell D. Organ
Answer: A

21. 2. Which of the following shows the. correct order of the levels of
2. Which of the following shows the correct order of the levels of organization from simplest to most complex?
A. organ system, organ, tissue, cell
B. cell, tissue, organ, organ system
C. tissue, cell, organ system, organ
D. organ system, tissue, cell, organ
Answer: B

22. 3. A group of organ systems makes up
A. an organelle.
B. a cell.
C. a tissue.
D. an organism.
Answer: D
4. Which type of tissue are bones made of?
A. epithelial
B. connective
C. muscle
D. nervous
Answer: B

23. 5. Which level of organization is represented by a
5. Which level of organization is represented by a group of different tissues that work together to perform a function?
A. cell
B. tissue
C. organ
D. organism
Answer: C