<prompt> Fenestrated capillaries are present in:SkinBrainSkeletal muscleSmall intestine  <response>: Ans: D Small intestine Ref: Ganongs Review of Medical Physiology, 21st ed and Textbook of Medical Physiology, Indu Khurana, pg: 432Explanation:in most endocrine glands, the intestinal villi, and parts of the kidneys, the cytoplasm of the endothelial cells is attenuated to form gaps called fenestrations. These fenestrations are 20-100 nm in diameter. They permit the passage of relatively large molecules and make the capillaries porous. Ref: GanongType of Capillaries Continuous or SomaticFenestratedSinusoidalJunctions Has tight junctions 10 -15 microns Has larger openings- circular pores 50 -100 nm Has largest openingsMovement of fluids and solutes Fluid cannot diffuse easily Solutes and fluids move with more ease than continuous type Solutes and fluids move freelyRemarks Most common type seen in connective tissue Seen where there rapid exchange of molecules between blood and organs Most prevalent type Seen in hematopoietic systemsLocation Fat Muscle Brain Connective tissue Lung Small intestinal wlii Kidney Endocrine glands Choroid plexus Liver Bone marrow SpleenSchematicrepresentation 