To return to the lesson, click the Back button or press Esc. Resources

To return to the lesson, click the Back button or press Esc. What Are Communicable Diseases? Image Bank

To return to the lesson, click the Back button or press Esc. Microorganisms and Communicable Diseases Image Bank

To return to the lesson, click the Back button or press Esc. Image Bank Diseases by Type of Pathogen

To return to the lesson, click the Back button or press Esc. Preventing Communicable Diseases Image Bank

To return to the lesson, click the Back button or press Esc. The Immune Response Image Bank

To return to the lesson, click the Back button or press Esc. Nonspecific Defense Image Bank Click image to view movie.

To return to the lesson, click the Back button or press Esc. Vaccination Image Bank

To return to the lesson, click the Back button or press Esc. Common Communicable Diseases Image Bank

To return to the lesson, click the Back button or press Esc. Other Common Communicable Diseases Image Bank

Read the passage below and then answer the questions. Bacteria, including pathogens, reproduce by binary fission, or simple division. Under ideal conditions, the average time for bacterial division to occur is about 15 minutes. However, the times vary from about 10 minutes to about 24 hours. From a single bacterium, how can you find out how many bacteria exist after a certain length of time? To return to the lesson, click the Back button or press Esc. TAKS Test Practice

Read the passage below and then answer the questions. It’s not simple multiplication because more and more bacteria are undergoing fission all the time. From the initial bacterium, two are formed. From these two, four form. How can you describe this pattern? After one reproductive cycle, you have two bacteria, or 2 1. After two cycles, you have four, or 2 2. You can summarize this pattern by the formula B = 2 n, where B is the number of bacteria, and n is the number of reproductive cycles. To return to the lesson, click the Back button or press Esc. TAKS Test Practice

1. How many bacteria exist after six reproductive cycles? A. 12 B. 32 C. 64 D. It depends on the length of the reproductive cycle. To return to the lesson, click the Back button or press Esc. TAKS Test Practice

2. One bacterium has a reproductive cycle of 20 minutes. How many bacteria will there be at the end of three hours? A. 9 B. 60 C. 512 D. 600 To return to the lesson, click the Back button or press Esc. TAKS Test Practice

3. What would be the shape of the graph where time is plotted on the x-axis and the number of bacteria is plotted on the y-axis? Where is the slope of the line the steepest? To return to the lesson, click the Back button or press Esc. TAKS Test Practice

Make this Foldable to help you organize what you learn about communicable diseases. Begin with two sheets of 8½” x 11” paper. Stack two sheets of paper with the short edges 1½” apart. To return to the lesson, click the Back button or press Esc. Before you read Foldables

Roll the bottom edges of the paper up so that the bottom edges are 1½” from the top edges. To return to the lesson, click the Back button or press Esc.

Foldables To return to the lesson, click the Back button or press Esc. Fold and staple to hold the tabs in place. Label as shown.

To return to the lesson, click the Back button or press Esc. Diseases by Type of Pathogen Transparencies

To return to the lesson, click the Back button or press Esc. Physical and Chemical Barriers—The Body’s First Line of Defense These elements work together as your body’s first line of defense to prevent pathogens from entering and causing disease.

Transparencies To return to the lesson, click the Back button or press Esc. The Immune Response The immune response is a complex interaction between your body and an invading pathogen. It can be broken down into eight distinct stages.

Transparencies To return to the lesson, click the Back button or press Esc. Immunity and the Lymphatic System The lymphatic system circulates antibodies to give you protection against many diseases. This protection can last throughout your life.

Transparencies To return to the lesson, click the Back button or press Esc. Other Common Communicable Diseases