review of unit 5 structures and functions of living organisms lesson 35
TRANSCRIPT
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Review of Unit 5 Structures and Functions of Living Organisms
Lesson 35
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Congratulations! We have finished Unit 5 Living Organisms. Now it is time to review what we learned.
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Take out your K-W-L chart in your notebook and as we review, write what you learned from this unit on Living Organisms. Write it in the What I Learned section.
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In this unit we learned that some living things are unicellular and some are multicellular.
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An amoeba is a unicellular organism. This one and only cell can perform all
the life functions.
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The amoeba can carry out eating, digestion, locomotion, breathing and removal of waste all in one
single cell.
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Multicellular organismsare organisms that consist of more than one cell and have differentiated cells that perform specialized functions in the organism.
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Multicellular organisms are dependent on each other for the organism to survive, but if
one cell dies the organism can keep living.
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How are structure and
function related in living
things?
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Function is the job a living thing does, and structure is the shape and the materials the
living thing is made of.
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Unicellular organisms develop functions that will help them
survive, and they develop structure that will support those
functions.
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We learned that all unicellular
organisms must be small, so the
organism’s surface area is greater
than or equal to the organism’s volume. This allows the
organism to ventilate.
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We learned that cells within a multicellular organism, such as an elephant, can not ventilate. They are too far away from the surface to get oxygen or release carbon
dioxide.
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We learned that larger multicellular organisms need transport systems to meet the
needs of all cells in the body.
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Multicellular organisms have division of labor, which means cells
specialize in certain functions. Cells do
not do all the functions of the
body. They only do a certain function.
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All unicellular organisms must
be small. Larger organisms must be multicellular so the organism
can survive.
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Circulatory System is responsible for
transporting materials
throughout the entire body.
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We learned that the circulatory system is
a system that helps blood to transport nutrients, oxygen,
carbon dioxide, blood cells, etc. to and from
cells in the body to nourish them and help
them to survive.
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We learned the circulatory system is composed of the heart and blood vessels,
including arteries, veins, and capillaries.
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We learned that the respiratory system
allows much needed oxygen in the air to be taken into the body, while also
enabling the body to get rid of carbon
dioxide from the body into the air the
body breathes out. lungs
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Respiration is when the body exchanges the
oxygen it takes in for the carbon dioxide it
needs to get rid of.
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All of this breathing couldn't happen
without the respiratory
system, which includes the nose, throat,
voice box, windpipe, and
lungs.
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These two systems work well together.
The respiratory
system brings the air into the body and releases
carbon dioxide from
the body.
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And the circulatory
system transports the oxygen to the cells
and the carbon
dioxide to the lungs to be released.
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A Skeletal system is
made up of the bones
of the body.
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Every single person has a
skeleton made up of many bones.
These bones give your body
structure, let you move in many
ways, protect your internal organs,
and more.
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The skeletal system is made up of the
skull, the ribs, vertebrae, the
pelvis and many, many more. Adults have 206 bones in
their body.
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A Muscular System is made up of the muscles of the body.
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Muscles do everything from pumping blood throughout your body to helping
you lift your heavy backpack.
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You control some of your muscles, while others —
like your heart — do their jobs without you
thinking about them at all.
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Muscles are all made of the same material, a type of elastic tissue
(sort of like the material in a rubber band). Thousands, or even tens of thousands, of small fibers
make up each muscle.
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You have three different types of muscles in your body: smooth
muscle, cardiac muscle, and skeletal muscle.
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The skeletal
system and the
muscular system work
together.
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Together, the skeletal muscles work with your bones to give your body power and strength. In
most cases, a skeletal muscle is attached to one end of a bone. It stretches all the way across a joint
(the place where two bones meet) and then attaches again to another bone.
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Skeletal muscles are held to the bones with the
help of tendons. Tendons are cords
made of tough tissue, and they work as special
connector pieces between bone and
muscle.
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Food is our fuel, and its nutrients give our
bodies' cells the energy and
substances they need to operate. But before food can do
that, it must be digested into small pieces the body can
absorb and use.
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The digestive system is
responsible for taking the
food we eat and breaking
it down to parts that can be used by the
cells of the body.
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The digestive system includes
the mouth, esophagus,
liver, stomach, gall bladder,
pancreas, small intestines,
large intestines and the rectum.
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The nervous system is in
charge of sending out messages
throughout the body. The nervous system is comprised of
two parts.
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The central nervous system is comprised of the brain and spinal
cord. The peripheral nervous system consists of
many nerves spread across the
body.
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The brain is the boss of the body. The brain is the most complicated organ of our body. It has three
major parts. The cerebrum, the brain stem and the cerebellum.
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It's the spinal cord and nerves — known as the nervous system —
that let messages flow back and forth between the brain
and body.
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Some of the nerves receive
information and some carry
information from the brain to the
body.
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Now take some time to review the vocabulary for Unit 5 with a
friend.
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In our next lesson we will take a test on
all the information we have learned in
Unit 5.
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Good Job Today!
And remember to….
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See you next time!