1. Human Body Basics BW
Margy’s argument is the best answer. All living organisms are made of cells. The cell is the basic unit of structure in all living organisms. What is less obvious is that the cell is also the basic unit of function.
It is within the cell that most of life’s basic processes such as getting rid of waste molecules, growth, repair, movement occur.

2. Human Body Basics
In addition to the basic cell functions, specialized cells in multicellular organisms perform functions that support life processes. Ex: muscle cells contract to support movement.
Specialized cells can be arranged to form tissues, such as muscle, nerve tissue, and blood tissue.
Tissues can be arranged to form organs
Organs to Organ Systems

3. LT #4 I can express that cells differentiate to form specialized cells, tissues, organs, organ systems, and organisms.

4. Labor of Division
Within a multicellular (meaning made of more than one cell, so yourself) organisms there is a division of labor.
Division of labor means that the work of keeping the organisms alive is divided among different parts of the body.
Each part has a specific job, it works in harmony with all the other parts.
The arrangement of specialized parts within a living thing is sometimes referred to as levels of organization.

5. Level 1: Cells Cells, of course, are the first level of organization.
In multicellular organisms, many cells are specialized to perform a specific function for the organism.
Ex: Muscle Cells, Nerve Cells, Bone Cells, Red Blood Cells, White Blood Cells, Lung Cells, Etc.

6. Level 2: Tissues
In any multicellular organisms, cells rarely work alone.
Cells that are similar in structure and function that work together to do a specific job are called tissues.
Your body, like that of many other animals, is made up of several types of tissue.
Ex: Bone cells form bone tissue, a
strong, solid tissue in your body
that gives you shape and support.

7. Level 2: Tissues
You also have muscle tissue and nerve tissue that work together to move your body.
Cells of the muscle tissue contract or relax to allow your body to move. But this movement does not occur until direction is given by cells of the nervous tissue.

8. Level 2: Tissues Plants have tissues, too.
One tissue moves food around the plant to cells that need it.
Another tissue carries water up from the plant’s roots to its leaves.
Still another plant tissue forms the hard outer covering of trees known as bark. Bark is a tissue that acts as a protective covering for woody plants.

9. Level 3: Organs
Just as cells join together to form tissues, different tissues join together to form organs.
An organ is a structure made up of two or more tissues that work together to carry out a specific job.
Ex: Your heart, is an organ made up of muscle tissue, blood tissue, and nerve tissue.
Others organs are: Bones, Brain, Spinal Cord, Pancreas, Spleen, Tonsils, Lungs, Small Intestine, Kidneys, Bladder, Etc.
Roots, stems, and leaves are three organs found in many plants.

11. Level 4: Organ Systems
Organs do not usually work alone. Instead, several organs work together as an organ system.
An organ system is made up of all organs that work together to do a specific job.
Ex: A plant’s leaves, stems, and roots work together to make, transport, and store food.

12. System
Main Organs
Function
Integumentary
Skin
Protects the body and prevents water loss
Muscular
Muscles
Movement of the body, attached to bones
Skeletal
Bones
Support and protection of soft body parts
Nervous
Brain, Spinal Cord, Nerves
Controls mental and bodily functions
Endocrine
Pancreas, Pituitary Gland
Controls homeostasis by releasing hormones

14. System
Main Organs
Function
Circulatory
Heart, Blood Vessels
Transport of materials to and from body cells
Lymphatic
Spleen, Thymus, Tonsils
Remove dead cells and foreign bodies from body fluids
Respiratory
Lungs, Trachea
Exchange of gases between blood and the environment
Digestive
Stomach, Small Intestine
Break down food for absorption into the blood
Urinary
Kidneys, Bladder
Control of water balance and chemical makeup of blood

16. Level 5: Organisms
You are an organism. Dogs and trees are also organisms.
An organism is an entire living thing that carries out all the basic life functions.
The organism is the fifth and highest level of organization.
Organisms are made up of cells, tissues, organs, and organ systems.

18. Cells, Tissues, Organs, Organ Systems, and Organisms
By now two things should be clear to you:
Each level of organization interacts with every other level.
The smooth functioning of a complex organism is the result of all its various parts working together.

19. Levels of Organization

20. Five-Tab Foldable
For each level include:
definition
example
picture