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WHAT MAKES UP CELLULAR ORGANISMS?
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Cells are the smallest living parts of plants and animals.
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Cells have the same needs as any organism.
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Cells carry out many of the same activities.
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Cells are made of smaller parts, each having a specialized job.
CELLS AND THEIR FUNCTIONS
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Cells are the basic units of all living things.
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A single drop of blood holds millions of red blood cells.
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Cells take in food and get rid of wastes.
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Cellular respiration is the combining of oxygen and food, such as sugar,
to get energy.
THE PARTS OF CELLS
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The membrane surrounds the cell and holds the parts of the cell together.
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A vacuole is surrounded by a membrane and contains fluids.
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Ribosomes are organelles that begin the process of making proteins.
THE SIZE AND SHAPE OF CELLS
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If a cell is too small, there would not be enough room for all of it’s parts.
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If a cell is too large, oxygen and other materials could not travel to all parts of the
cell fast enough to keep the cell alive.
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Many cells have a special shape that fits the job the cells do.
CELLS FORM TISSUES
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Cells often work with tissues.
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A tissue is a group of the same kind of cells that work together to do the same
job.
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Muscle cells group in bundles to make up muscle tissue.
TISSUES FORM ORGANS
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Tissues join with other types of tissue to form organs.
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An organ is a group of different tissues that join together into one structure.
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Your heart , eyes, ears, and stomach are all organs.
ORGAN SYSTEMS
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An organ system is a group of organs that work together to carry out a life
process.
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Blood cells, blood vessels, and the heart work together to move materials through
the body.
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The mouth, stomach, intestines, and other organs work together to digest food.
THE TRANSPORT OF NUTRIENTS AND WASTES
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In many animals, blood transports nutrients to the cells of the body.
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Blood is a tissue of the circulatory system.
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