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Multicellular Organization
Section 7.4 – Homeostasis and Cells
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Place the following terms in order:
Simplest Most ComplexWordParagraphLetter (A, B, C,…)ChapterBookSentence
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Unicellular vs. Multicellular:
In unicellular organisms (prokaryotes & eukaryotes), one cell carries out all of the functions of life.
Most cells of multicellular organisms are specialized to perform one or a few functions so they depend on the other cells for survival.
Both unicellular and multicellular need to maintain homeostasis
plant-like protist
animal-like protist
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Place the following terms in order:
Simplest Most ComplexOrganTissueOrganismCellOrgan System
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Multicellular Organization:
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We are all made of cells
Cells
Tissues
Organs
Organ
System
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Cells:Basic unit of structure and function in
living things.Cells with a specific structure and
function and are found in multi-celled organisms.
Examples: skin cells, blood cells, brain cells, bone cells, liver cell, nerve cells, muscle cells, etc.
Brain cells
Blood cells
Liver cells
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Tissues:
Group of similar cells that carry out a specific function.
Examples: epithelium connective muscle nervous
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Tissues:
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Tissues Continued:
Epithelium – sheets of closely packed cells that cover surfaces
Connective – loosely scattered cells to support and link together other tissues
Muscle – pull against one anotherNervous – transmitting messages
rapidly
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Organs:
Several types of tissues that interact to perform a specific function.
Examples: stomach, kidney, liver
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Organs Continued:
The stomach has muscular, epithelial, connective, and nervous tissue.
All but the simplest animals have organs.
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Organ Systems:
Groups of organs that work together to perform a set of related tasks.
Examples: digestive, respiratory, circulatory
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Organ Systems
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Organ Systems Continued:
Mouth, esophagus, stomach, and intestines make up the digestive system.
Each organ performs a specific function in food digestion.
Organ systems interact with other systems like the respiratory system which supplies oxygen to cells to digest food.