Objectives 30.1 Levels of Organization Describe how the human body is organized. Explain homeostasis.

Objectives 30.1Levels of

Organization

Describe how the human body is organized.

Explain homeostasis.

Lesson Overview Organization of the Human Body

The levels of organization in the human body include:

Cells

Tissues

Organs

Organ systems

Lesson Overview Organization of the Human Body

Cells

A cell is the smallest unit of life.

Lesson Overview Organization of the Human Body

Tissues

A tissue is a group of cells that come together to form a particular function.

Lesson Overview Organization of the Human Body

Types of Tissues:

1. The tissue that lines the inside and outside of the body is epithelial tissue.  

Lesson Overview Organization of the Human Body

2. Tissue that provides support for the body and connects its parts is connective tissue.  

Lesson Overview Organization of the Human Body

3. Nerve impulses are transmitted throughout the body by nervous tissue.  

Lesson Overview Organization of the Human Body

4. Movements of the body are possible because of muscle tissue.

Lesson Overview Organization of the Human Body

Organs

A group of different types of tissues that work together to perform a single or several related functions is called an organ.  

Lesson Overview Organization of the Human Body

Organ Systems

An organ system is a group of organs that perform closely related functions.  

Lesson Overview Organization of the Human Body

Homeostasis

Homeostasis describes the ability of an organism to maintain a constant internal environment despite changes in external environments.