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I was introduced to Khan Academy by a college advisor.  After exploring the contents for only 20 minutes, I was thoroughly impressed.  The website includes tutorial videos in every subject and within each subject, there are tons of subcategories to study.  For instance, I can click “science->biology->human biology->the lungs and pulmonary system” and voila!  I highly recommend you use this to help you study, review materials or if you’re simply thirsty for knowledge; go crazy!

The Lungs and Pulmonary System: The pulmonary system including the lungs, larynx, trachea, bronchi, bronchioles, alveoli and thoracic diaphragm