Organization of Multicellular Organisms
How do different structures carry out the functions of life?
How are multicellular organisms organized?
Multicellular organisms have different structures that perform specialized functions
From smallest to largest: cell, tissue, organ, organ system, organism
What is a multicellular organism?
Which is NOT a level of organization in multicellular organisms?
The cell is the smallest unit of life
Different cells are specialized to carry out specific functions
Ex: Nerve Cells are long with many projections that connect to other nerve cells and transmit signals around the body
RESEARCH! What are three different types of specialized cells?
FLASHBACK! Check all of the following that are organelles found in animal cells.
Groups of similar types of cells that work together to carry out specific tasks in multicellular organisms
Ex: Nervous tissue – carries messages to and from the brain
True or False: Tissues are made of several different types of cells
Different groups of tissues working together to perform a particular job
Can be made up of several different tissue types
Ex: The Brain – made of nerve tissue, connective tissue, epithelial tissue, etc. Function: Control center for all the body’s functions, such as walking, talking, heart rate, etc.
Choose all of the following that are ORGANS in the human body.
Groups of organs that work together to complete a series of tasks
Ex: Nervous System – brain, spinal cord, nerves
• Monitors changes inside and outside the body
• Processes and interprets sensory input
• Supplies response by activating muscles or glands
An organ system is a group of organs that work together to perform a particular task. Choose all of the following that are also systems.
Other Organ Systems
Digestive: breaks down food and absorbs nutrients
Excretory: removes solid, liquid and gas waste from the body
Respiratory: exchanges gases between the body and the environment
THINK! What do you think would happen to a human if they did not have a digestive system? Why do you think this would happen?
Other Organ Systems
Circulatory: transports nutrients, gases, wastes and other substances through the body
Muscular: allows movement
Skeletal: protects internal organs, provides support, helps the body move and stores minerals
Which of the following is the correct order of the levels of organization from smallest to largest?
An individual living thing, such as a plant, animal, bacterium, protest, or fungus
Has a body made of smaller parts that work together
All organisms must be able to perform all 6 Characteristics of Life
Check all of the following that are Characteristics of Life.
Why do you think its important that living things are organized?