Organization of Living Things

What does 'Organization of Living Things' mean?

We know it all starts with the cell. And for some species it ends with the cell. But for others, the cells come together to form tissues, tissues form organs, organs form organ systems, and organ systems combine to form an organism.

Levels of Organization

The living world can be organized into different levels. For example, many individual organisms can be organized into the following levels:

• Cell: Basic unit of structure and function of all living things.
• Tissue: Group of cells of the same kind. 
• Organ: Structure composed of one or more types of tissues. The tissues of an organ work together to perfume a specific function. Human organs include the brain, stomach, kidney, and liver. Plant organs include roots, stems, and leaves. 
• Organ system: Group of organs that work together to perform a certain function. Examples of organ systems in a human include the skeletal, nervous, and reproductive systems.
• Organism: Individual living thing that may be made up of one or more organ systems.
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                                                    Cells make up tissue
  Tissues makes up organs
  Organs make Organ Systems
  Organs Systems make
  Organisms
  

Types of TissueThere are four main types of tissue: muscle, epithelial, connective and nervous. 

Each is made of specialized cells that are grouped together according to structure and function. Muscle is found throughout the body and even includes organs such as the heart.

There are 3 types of Muscle Tissue

Lesson Review

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• 1. 
  The smallest living this is
  • A. 
    A cell
  • B. 
    A tissue
  • C. 
    An organ
  • D. 
    An organ system
  • E. 
    An organism
• 2. 
  Anything living is also called
  • A. 
    A tissue
  • B. 
    An organism
  • C. 
    An organ
  • D. 
    An organ system
  • E. 
    A cell
• 3. 
  A group of cells working together is
  • A. 
    An organism
  • B. 
    An organ system
  • C. 
    An organ
  • D. 
    A tissue
  • E. 
    A cell
• 4. 
  A group of tissues working together is
  • A. 
    A tissue
  • B. 
    A cell
  • C. 
    An organ
  • D. 
    An organ system
  • E. 
    An organism
• 5. 
  A group of organs working together is
  • A. 
    An organ system
  • B. 
    An organism
  • C. 
    An organ
  • D. 
    A cell
  • E. 
    A tissue

    
    

    6. Which of the following is NOT one of the four main types of tissues?

       a. basement
       b. epithelial
       c. connective
       d. muscle

    7. Which type of tissue is designed to stretch?
       a. stratified
       b. squamous
       c. transitional
       d. epthelial

    8. Tissues are groups of similar cells working together to:
       a. increase the size and mass of structures in the body
       b. perform common functions
       c. fight against diseases
       d. deliver messages

    9. Smooth muscle is found mainly in:
       a. the heart
       b. the stomach
       c. the brain
       d. the skeletal system

10. What does the X represent?