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 Body Tissues 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.

3. 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.

4. 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.

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, 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.

6. 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.

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, continued –Epithelial tissue often provides a protective barrier for surfaces.

8. 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.

9. 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.

10. 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

11. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Cellular Organization Quiz 1.The way cells organize to form an organism is called ______ _________. 2.Cells with a similar structure that work together to perform a function make up a ___________. 3.How many major types of tissues are there?

12. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Quiz Cont’d 4.List the 3 types of muscular tissue. 5.Define organ. 6.When a group of organs work together to perform a particular function they form an ______ ______. 7.An organism is made up of several different ______ _____.