Transcript 4.3 PowerPoint - St. Paul School

Organization of
Living Things
Section 4.3
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What do we know?
 Which one of your body systems is the most
important?
 Why do you think scientists use the word system to
describe your skeleton or your digestive system?
 Can you think of an activity you do that requires
different parts of your body to work together?
A Question of Scale
 Make a list of the life activities of a pond organism
that can only be seen under a microscope, such as an
amoeba.
 Make a second list of the life activities of a fish.
 Compare the two lists.
 Which organism do you think can adapt to a wider
range of conditions? Why?
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Organisms
 Humans are considered many-celled organisms (we are
made up of trillions of cells)
 But other organisms are made up of only one cell (for
example an amoeba)
 To see most single-celled organisms, you need a
microscope.
 A many-celled organism carries out more complex
activities than a single-celled organism.
 Many-celled organisms have specialized cells to perform
different tasks.

However, these cells must be organized so they can work
together.
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Levels of Organization
 There are 5 main levels of organization:
 Cells
 Tissues
 Organs
 Organ Systems
 Organism
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Cells, Tissues, & Organs
 Most many-celled organisms have specialized cells
 Specialized- different cells that do different kinds of
work.
 Each type of specialized cells are organized into
tissues
 Where each kind of tissue performs a certain function.
 Tissues are then organized into groups called organs.
 Organ- group of tissues that work together to perform
special functions.
 Both plants and animals have tissues and organs.
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Organ Systems
 A group of organs that work together make up an
organ system.
 Some organisms have no organ systems (sponges)
 Others have a few organ systems (flatworms)
 More complex organisms have ten organ systems
(dogs and humans)
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Organisms
 Highest level of cellular organization is the organism.
 All organisms carry out life processes.
 The different organ systems work together to keep the
organism alive.
 Respiratory system- enables you to breathe
 Muscular & Skeletal system- enable you to support,
protect, and move your body.
 Digestive system- enables you to process the nutrients
your body needs to work properly.
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What do you think?
 Look at the illustrations on page 86 and 87 in your
book:
 Which picture shows cells most clearly?
 What do you think the term cardiac means?
 What system is shown in the picture of the runner?
 What tissues make up the circulatory system?
 What are the names of different types of blood vessels?
What have we learned?
1. List at least one example of each of the following:
cell, tissue, organ, organ system, and organism.
2. Describe the difference between a cardiac muscle cell,
cardiac muscle tissue, and the heart.
3. Can a single-celled organism contain tissue? Explain.
4. Classify the following as a tissue, organ, or system:
a.
Brain, spinal cord, and nerves
b.
Heart
c.
Group of muscle cells