Lesson 5 - Levels of OrganizationThe 5 levels of organization

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!

1st Level--Cells

Let’s put these 5 levels together.Level 1 – Cells (Heart)

--------->

Level 2 – Tissues (Veins,Arteries, Capillaries)

Level 3 – Organs (Heart)

Level 4-Organ System (Circulatory System)

------------------------>

Level 5 – Organism (You)

4 types of Human Tissue

1. Epithelial

2. Connective

3. Muscle

4. Nervous

1st- Epithelial Tissue

Closely packed cells that cover body

surfaces and the Internal structures.

Examples-Skin and

blood vessels

2nd – Connective Tissue

Has many different

forms and functions

Bone, Fat,Cartilage, Blood

Examples:

3rd – Muscle Tissue

Contracts to allow movement.

Heart, Biceps, Tongue

Examples:

4th – Nervous Tissue

Transmits and processes information.

Spinal Cord,Brain, Nerves

Examples:

The Organ Systems of the Human Body

1. Respiratory

2. Circulatory

3. Nervous

4. Digestive

5. Urinary

6. Muscular

7. Skeletal

8. Reproductive

9. Endocrine

10. Immune

11. Integumentary

aka--Lymphatic

aka--Cardiovascular

aka--Excretory

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.

2nd Body System - Circulatory

Organs – Heart, blood, blood vessels

Function –Carries oxygen

and food to the cells and carbon dioxide away from the cells as

waste; fights infection.

Aka: Cardiovascular

3rd Body System - Nervous

Organs – Brain, spinal cord, peripheral nerves, sense organs

Function –

Organizes the body’s response to stimuli, or changesin its internal or external environment.

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.

5th Body System – Urinary

Organs – Skin, lungs, kidneys, Ureters, urinary bladders, urethra

Function – Removes waste fromthe body.

Aka: Excretory

6th Body System - Muscular

Organs – Skeletalmuscles, smooth muscles, heart (cardiac)

Function – Works with skeletalsystem to produce movement.

7th Body System - Reproductive

Organs – Male: Produces and

delivers sperm.

Female: Produces eggs and nourishes and shelters the unborn baby.

8th Body System - Skeletal

Organs – Bones, cartilage, ligaments, tendons

Function – Supports the body and protects internal organs.

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!!

10th Body System - Immune

Organs – White blood cells, thymus, spleen, lymph nodes,lymph vessels.

Function – Protects the body from disease.

Works with the

Lymphatic system

11th Body System - Integumentary

Organs – Skin, hair, nails, sweatand oil glands.

Function – Acts as a barrier against infection and injury.

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.

1.Which of the following is not a level of organization in the human body?

A. Organelle C. Tissue

B. Cell D. Organ

Answer: A

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

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

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