unit 2 lesson 4 levels of cellular organization copyright © houghton mifflin harcourt publishing...
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Unit 2 Lesson 4 Levels of Cellular Organization
Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 2 Lesson 4 Levels of Cellular Organization
Florida Benchmarks
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• SC.6.L.14.1 Describe and identify patterns in the hierarchical organization of organisms from atoms to molecules and cells to tissues to organs to organ systems to organisms.
• LA.6.4.2.2 The student will record information (e.g., observations, notes, lists, charts, legends) related to a topic, including visual aids to organize and record information and include a list of sources used.
Body Building
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How are living things organized?
• An organism is a living thing that can carry out life processes by itself.
• Unicellular organisms are single-celled and do not have levels of organization.
Unit 2 Lesson 4 Levels of Cellular Organization
Body Building
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How are living things organized?
• Unicellular organisms need fewer resources and can live in harsh conditions.
• They are very small and are easily eaten by other organisms.
• If the single cell dies, the entire organism dies.
Unit 2 Lesson 4 Levels of Cellular Organization
How are living things organized?
• Multicellular organisms have multiple cells that are grouped into different levels of organization.
• Multicellular organisms are larger, more efficient, and have a longer life span than unicellular organisms.
• Multicellular organisms need more resources than unicellular organisms.
• The cells must depend on each other for the survival of the organism.
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Unit 2 Lesson 4 Levels of Cellular Organization
How are living things organized?
• A tissue is a group of similar cells that perform a common function.
• Humans and other animals are made up of nervous, epithelial, connective, and muscle tissues.
• Plants have transport, protective, and ground tissues.
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Unit 2 Lesson 4 Levels of Cellular Organization
How are living things organized?
• An organ is a structure made up of a collection of tissues that carry out specialized functions.
• Different tissues can work together to accomplish a function, such as digesting food.
• Plants have organs such as leaves, stems, and roots.
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Unit 2 Lesson 4 Levels of Cellular Organization
How are living things organized?
• An organ system is a group of organs that work together to perform body functions.
• Each organ system in the body has a specific job to do for the organism.
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Unit 2 Lesson 4 Levels of Cellular Organization
How are living things organized?
• What are the levels of organization in this tree?
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Unit 2 Lesson 4 Levels of Cellular Organization
What’s Your Function?
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How do the levels of organization work together?• Cells, tissues, organs, and organ systems make up
the structure of multicellular organisms.
• Structure is the arrangement of parts in an organism or object.
• Function is the activity of each part in an organism.
Unit 2 Lesson 4 Levels of Cellular Organization
How do the levels of organization work together?• Tiny air sacs in the lung are called alveoli. What is
the structure and function of alveoli?
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Unit 2 Lesson 4 Levels of Cellular Organization
Unit 2 Lesson 4 Levels of Cellular Organization
Odd Bodies
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• Different organisms develop many different kinds of body structures.
• The spiny katydid has spines to protect it from being eaten.
Unit 2 Lesson 4 Levels of Cellular Organization
Odd Bodies
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• The longhorn cowfish has a puckered mouth to blow away sand on the shallow ocean floor to find and feed on tiny organisms.
• The tarsier has huge eyes to give it better night vision for finding insects to eat. It also has long fingers to help it grasp branches.
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