Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 3 The Organization of Living Things Bellringer Why can’t.

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Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 3 The Organization of Living Things Bellringer Why can’t you use your teeth to breathe? Why can’t you use your arm muscles to digest food? Write your answers in your science journal. Chapter 3

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 3 The Organization of Living Things Objectives List three advantages of being multicellular. Describe four levels of organization in living things. Explain the relationship between the structure and function of a part of an organism. Chapter 3

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 3 The Organization of Living Things Vocabulary tissue organ organ system organism structure function Chapter 3

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 3 The Organization of Living Things The Benefits of Being Multicellular Larger Size Larger organisms are prey for fewer predators. Larger predators can eat a wider variety of prey. Longer Life The life span of a multicellular organism is not limited to the life span of a single cell. Specialization Each type of cell has a particular job. Specialization makes the organism more efficient. Chapter 3

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 3 The Organization of Living Things Cells Working Together A tissue is a group of cells that work together to perform a specific job. Animals have four basic types of tissues: nerve tissues, muscle tissue, connective tissue, and protective tissue. Plants have three types of tissues: transport tissue, protective tissue, and ground tissue. Chapter 3

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Nerve Tissue Muscle Tissue Connective Tissue Protective Tissue Section 3 The Organization of Living Things Chapter 3

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 3 The Organization of Living Things Chapter 3 Plant tissues

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 3 The Organization of Living Things Tissues Working Together A structure made up of two or more tissues working together to perform a specific function is called an organ. The heart, stomach, intestines, brain, and lungs are examples of organs in humans. Leaves, stems, and roots are examples of plant organs. Chapter 3

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 3 The Organization of Living Things Tissues Working Together, continued A group of organs working together to perform a particular function is called an organ system. Each organ system has a specific job in the body. Examples of organ systems are the digestive system, the respiratory system, and the cardiovascular system. Examples of plant organ systems are leaf systems, root systems, and stem systems. Chapter 3

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 3 The Organization of Living Things Chapter 3

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 3 The Organization of Living Things Organisms Anything that can perform life processes by itself is an organism. An organism made of a single cell is a unicellular organism. A unicellular organism must carry out all life processes in order for that cell to survive. In contrast, multicellular organisms have specialized cells that depend on each other for the organism to survive. Chapter 3

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 3 The Organization of Living Things Structure and Function In organisms, structure and function are related. Structure is the arrangement of parts in an organism. Function is the job that the part does. Chapter 3

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 3 The Organization of Living Things Structure and Function, continued Chapter 3 The structures of alveoli and blood vessels enable them to perform a function. Together, they bring oxygen into the body and get rid of its carbon dioxide.

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 3 The Organization of Living Things Section Summary Advantages of being multicellular are larger size, longer life, and cell specialization. Four levels of organization are cell, tissue, organ, and organ system. A tissue is a group of cells working together. An organ is two or more tissues working together. An organ system is two or more organs working together. In organisms, a part’s structure and function are related. Chapter 3