Gas exchange in the Lungs
This 3D animation describes why we need to respire oxygen and why that requirement is increased during exercise.
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Bone Grafting - Sinus Grafting
Dental implants are artificial teeth that are anchored to bone; however if the bone is too thin, the dental implant cannot be implanted. The animation describes the bone grafting procedure that is sometimes necessary to build up the bone show that it can support a dental implant.
Understand why your nose is blocked
There are several reasons why a person's nose or sinuses can become blocked including a deviated septum or chronic inflamed nasal turbinates. This video shows actual footage from a surgery aimed at relieving this blockage through removal of these offending nasal structures.