This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Aerio-venous anastomosis is not seen in: March 2011 
Select and explain. 
A. Sympathetic ganglia, B. Tip of Nose, C. Finger tip, D. Kidney
D: Kidney
Answer: D: Kidney 
Explanation: Ans. D: KidneyShunts of simpler structure is found in the skin of nose, lips and external ear; thyroid gland, sympathetic ganglia etc.Specialized AV anastomosis are found in the skin of digital pads and nail bedsAeries of kidney are end-aeriesAerio-venous anastomosesIt is the communication between an aery and a vein.It serves the function of phasic activity of the organShunts of simple structure are found in the:- Skin of the:NoseLipsExternal ear- Mucous membrane of:NoseAlimentary canal- Coccygeal bodyErectile tissue of sexual organs- Tongue- Thyroid gland- Sympathetic gangliaSpecialized AV anastomoses is seen in the- Skin of digital pads- Nail beds