Final answer:
The common locations of fenestrated capillaries include endocrine glands, kidneys, small intestine, and choroid plexuses of the brain. These capillaries have pores that permit the passage of larger molecules, facilitating various bodily functions such as nutrient absorption, filtration, and hormone secretion.
Step-by-step explanation:
Endocrine glands, kidneys, small intestine, and choroid plexuses of the brain are common locations of fenestrated capillaries. These capillaries have special pores, or fenestrations, that make them highly permeable and allow for the transfer of larger molecules compared to other capillary types. Fenestrated capillaries are crucial for efficient nutrient absorption in the small intestine, filtration in the kidneys, and hormone secretion in the endocrine structures. In contrast, sinusoid capillaries, with even larger openings, are found in organs like the liver and spleen.