Organization of Multicellular Organisms

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

Multiple Choice

What is a multicellular organism?

• an organism with one cell

• an organism with many cells

• an organism where organelles replace organs

Multiple Choice

Which is NOT a level of organization in multicellular organisms?

• tissue

• organ

• cell

• organelle

Specialized Cells

• 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

Open Ended

RESEARCH! What are three different types of specialized cells?

Multiple Select

FLASHBACK! Check all of the following that are organelles found in animal cells.

• chloroplast

• mitochondria

• cell membrane

• cell wall

• nucleus

Tissues

• 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

Multiple Choice

True or False: Tissues are made of several different types of cells

• True

• False

Organs

• 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.

Multiple Select

Choose all of the following that are ORGANS in the human body.

• diaphragm

• heart

• pistil

• lungs

• skin

Organ Systems

• 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

Multiple Select

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.

• computer

• pile of sand

• bicycle

• piece of paper

• aquarium

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

Open Ended

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

Multiple Choice

Which of the following is the correct order of the levels of organization from smallest to largest?

• organ system, orgsn, tissue, cell

• tissue, orgsn system, cell, organ

• cell, tissue, organ, organ system

Organism

• 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

Multiple Select

Check all of the following that are Characteristics of Life.

• Homeostasis

• Organization

• Response to Stimuli

• Growth & Development

Open Ended

Why do you think its important that living things are organized?