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Professor Dave Explains
The Circulatory System Part 3: The Lymphatic System
With the heart and blood vessels covered, isn't that a wrap on the circulatory system? Not without the lymphatic system! When fluid from the bloodstream exits the capillaries to join interstitial fluid, most of it enters again at the...
Khan Academy
Khan Academy: Sinusitis Diagnosis and Treatment
This video explains the diagnosis and treatment of the various types of sinusitis. [8:52]