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[Music]

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laughs

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shells

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have you ever built something using

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Legos or blocks if you have you probably

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used many different kinds sizes and

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colors

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cells are like Legos they are the

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building blocks of life

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in fact all living organisms are made up

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of cells you your pets and other animals

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cells also make flowers trees and plants

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there are three things that are

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important to remember about cells one

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all living things are made of one or

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more cells

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unicellular means it is a single celled

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organism like bacteria or Yeast

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multicellular means it's made up of many

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cells

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you are multicellular because it took

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many cells to make you in fact it took

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30 trillion cells

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two

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cells are the basic unit of life or the

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building blocks

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three new cells come from existing cells

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through division this means that cells

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make new cells by dividing themselves

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over and over again

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did you know that a baby starts out as a

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single cell

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that cell then divides until it forms a

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tiny ball of cells called A blastocyst a

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blastocyst is a group of cells

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surrounded by an outer shell eventually

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that inner group of cells becomes what

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we call an embryo that embryo is what

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develops into a baby

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the outer group of cells which are

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called membranes or what protect and

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give food to the embryo

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which keeps it alive and growing

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by week five the embryo cells are doing

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much more than just multiplying and

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dividing these different cells are

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beginning to be assigned various jobs

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some of the cells divide to become the

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baby's kidneys

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some become blood cells and nerve cells

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others become the baby's brain heart and

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spinal cord

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at about 40 weeks or nine months an

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entire baby has grown all from a tiny

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group of cells

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nearly all cells are very tiny and can't

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be seen without a special tool called a

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microscope

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you have probably seen a microscope and

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maybe even used one before

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they make small things look bigger

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under a microscope you can see the

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different parts of a cell

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just like blocks cells have different

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shapes colors designs and jobs

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there are three basic parts of animal

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and plant cells the nucleus is the brain

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of the cell which basically means it

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controls the cell

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cytoplasm is everything outside of the

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nucleus but inside the cell wall

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it is a large gel-like fluid

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cytoplasm gives cells its shape and

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holds everything in place

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the cell membrane is made up of fats and

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proteins

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it is the wall around the cell it keeps

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important things inside like nutrients

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and unwanted things out like waste

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here's a cool fact

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did you know that each time you break

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open an egg you see a large cell whoa

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plant cells are unique because they have

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two additional parts that animal cells

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don't they contain another protective

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barrier called the cell wall the cell

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wall surrounds the cell membrane

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both the cell wall and the cell membrane

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protect and support the cell the cell

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wall is made of a strong material that

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helps the cell keep its shape

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it also filters molecules that pass in

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and out of the cell

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how cool is that

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chloroplasts are the other extra part of

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a plant cell they create sugar through

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photosynthesis which uses energy

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molecules from the Sun to produce food

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for the plant

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a cool thing about plants is that

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everything we eat is either from a plant

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or from something that ate plants

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if you eat a hamburger the meat comes

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from a cow which feeds off plants

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plants and animal cells have many things

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in common as well as many differences

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animal cells are squishy movable and not

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regularly shaped plant cells are

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rectangular and rigid in shape

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plant cells can be bigger than animal

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cells

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there are some really amazing things

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that scientists can do with cells

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stem cells are unique special cells

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found in animal and humans

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they produce new cells for our bodies as

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they grow

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some of these cells are found in your

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bone marrow inside your bones

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stem cells can replace damaged or

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missing cells in your body

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stem cells are also found in a baby's

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umbilical cord

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after a baby is born a doctor saves the

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blood from the umbilical cord cord blood

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is used for people that have certain

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cancers or blood diseases to help the

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good cells regrow

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some plant cells are now being used to

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make biodegradable Plastics instead of

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products made from oil that don't break

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down and sit in our landfills for years

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these new products made from plant cells

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break down quicker and are less harmful

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to our environment just like bricks are

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the building blocks of houses and other

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buildings

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cells are the building blocks of animals

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and plants

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hope you had fun learning with us

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visit us at learnbrite.org

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for thousands of free resources and

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TurnKey solutions for teachers and

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homeschoolers

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[Music]