Explain how the following types of barriers to entry generate market power. 
Definitions:
Afferent Arteriole
A blood vessel that brings blood to the glomeruli (the filtering units) of the kidney from the systemic circulation.
Efferent Arteriole
A blood vessel that carries blood away from the glomerulus of the kidney, allowing for the regulation of blood pressure and filtration rate within the nephron.
Renin
An enzyme secreted by the kidneys that plays a critical role in the body's regulation of blood pressure.
Bile Recycling
The process by which bile acids, after aiding in digestion, are absorbed by the intestine and returned to the liver to be reused.
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