(c) McGraw Hill Ryerson 2007

2.1 Body Systems

• A system is made of parts that work together as a whole.

• The Characteristics of Systems 1. A system is made of individual parts that work together as a whole.

2. A system is usually connected to one or more systems.

3. If one part of a system is missing or damaged, the system will not function well or may not function at all.

See pages 54 - 55

A stereo system has many parts that work together.

(c) McGraw Hill Ryerson 2007

Systems of the Human Body

Eleven systems of the human body

See pages 56 - 57

•Circulatory System•Transports blood, nutrients, gases, and wastes

•Digestive System•Breaks down food and absorbs the nutrients

•Respiratory System•Exchanges gases in lungs and tissues

•Excretory System•Removes liquid and gas wastes from the body

•Immune System•Defends body against infections

•Endocrine System•Manufactures and releases hormones

(c) McGraw Hill Ryerson 2007

Systems of the Human Body

More Systems…

See pages 56 - 57

•Reproductive System•Includes reproductive organs for producing offspring

•Integumentary System•Creates a waterproof barrier around the body

•Skeletal System•Supports, protects, and works with muscles to move parts of the body

•Muscular System•Has muscles that work with the bones to move parts of the body

•Nervous System•Detects changes in the environment and signals the body to carry out a response

(c) McGraw Hill Ryerson 2007

Organ Systems

• An organ system has one or more organs that perform specific body functions. For example your heart is part of the circulatory system.

• The four levels of organization within the human body are:cell tissue organ organ

system

See page 58

Organ Systems

(c) McGraw Hill Ryerson 2007

(c) McGraw Hill Ryerson 2007

Tissues: The Foundation of Body Systems

See pages 58 -59

• Tissue is a group of cells that have the same structure and function.

• Four types of body tissue: Muscle tissue

Assists in body movement Nerve tissue

Transfers signals to and from brain

Connective tissue Holds together and supports other tissue

Epithelial tissue Covers the surface of organs and body

Take the Section 2.1 Quiz