- http://www.handwrittentutorials.com - This tutorial explores the Renin-Angiotensin-Aldosterone System, its role in Blood Pressure, the enzymes, involved, and how drugs act upon the system. For more...

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- AP biology endocrine system review.

- Cortical nephrons make up 85% of nephrons. Juxtamedullary nephrons make up 15% of nephrons.

- This is my second in a series of videos on sickle cell disease. Here is an outline of the series: 1. Introduction to Sickle Cell Disease: http://youtu.be/z65...

- This animation focuses on the renin angiotensin aldosterone system (RAAS), a classic endocrine system that helps to regulate long-term blood pressure and ext...

- Understand how nutrients and oxygen get to liver cells in a beautiful, organized manner. By Raja Narayan. More free lessons at: http://www.khanacademy.org/vi...