This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Renal physiology, Subject name: Physiology
Angiotensinogen is produced by 
Select and explain. 
A. Liver, B. Kidney, C. Hypothalamus, D. Atrium
A: Liver
Answer: A: Liver 
Explanation: Angiotensiogen is produced in liver and is conveed into AT1 by RAAS mechanism Ref: guyton and hall textbook of medical physiology 12 edition page number:489,490,491