1. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 2 Introduction to Cells Chapter 4 Cellular Organization In multicellular eukaryotes, cells organize into tissues, organs, organ systems, and finally organisms.

2. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 1 The Human Body Plan Chapter 45 Objectives Describe four types of tissues that make up the human body. Explain how tissues, organs, and organ systems are organized. Summarize the functions of the primary organ systems in the human body.

3. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 1 The Human Body Plan Chapter 45 Body Tissues All tissues are a collection of cells that have a similar structure and that work together to perform a particular function. Muscle Tissue –Muscle tissue is composed of cells that can contract in a coordinated fashion.

4. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 1 The Human Body Plan Chapter 45 Body Tissues, continued Muscle Tissue, continued –The human body has three types of muscle tissue: skeletal, smooth, and cardiac. Skeletal muscle moves the bones Smooth muscle controls body functions you cannot control consciously. Cardiac muscle, found in your heart, pumps blood through your body.

5. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 1 The Human Body Plan Chapter 45 Body Tissues, continued Nervous Tissue –Nervous tissue contains cells called neurons, that receive and transmit messages in the form of electrical impulses.

6. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 1 The Human Body Plan Chapter 45 Body Tissues, continued Nervous Tissue, continued –Nervous tissue can be found throughout the human body and has various functions. For example, nervous tissue can be found in the brain and sensory organs and is used to interpret sensory information.

7. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 1 The Human Body Plan Chapter 45 Body Tissues, continued Epithelial Tissue –Epithelial tissue is tissue that is composed of a sheet of cells and that covers a body surface or lines a body cavity.

8. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 1 The Human Body Plan Chapter 45 Body Tissues, continued Epithelial Tissue, continued –Epithelial tissue often provides a protective barrier for surfaces.

9. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 1 The Human Body Plan Chapter 45 Body Tissues, continued Connective Tissue –Connective tissue connects and supports other tissues.

10. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Chapter 45 Human Body Tissues Section 1 The Human Body Plan

11. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 1 The Human Body Plan Chapter 45 Organs and Organ Systems An organ consists of various tissues that work together to carry out a specific function. Groups of organs interact in an organ system. Organ systems work together to function in an efficient, integrated manner.

12. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Chapter 45 Major Organ Systems of the Human Body Section 1 The Human Body Plan