Question

the study of kidney function is an example of systemic physiology pathological physiology organ physiology regional anatomy

Explanation:

The kidney is an organ. Organ physiology studies the functions of specific organs. Systemic physiology focuses on body systems (not a single organ), pathological physiology is about abnormal function (not just normal kidney function), and regional anatomy is about anatomical regions (not function). So the study of kidney function is organ physiology.

Answer:

organ physiology