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This course provides an overview of the disease, distinguishing between active and latent TB, and explaining how a person is tested for TB.

The respiratory system is a group of organs and tissues that help humans breathe. The main parts of the respiratory system are the airways, the lungs and linked blood vessels, and the muscles that enable breathing. This course provides an overview of the human respiratory system.

This course provides an overview of the musculoskeletal system including a discussion of the major disorders that can affect it.