The best replacement for physiology is psychology.

The best alternatives to physiology are rated as following:
★★★★★  psychology
★★★★  anatomy
★★★  biology
★★  morphology
★★  medicine
★★  microbiology
★★  medicine nobel prize
★★  chemistry harder
★★  pathophysiology
★  physics
★  kinesiology
★  exercise science
★  psychiatry
  physiotherapy
  biomedical science
  biochemistry
  pathology
  sport physiology
  physiognomy

Your alternative for physiology is not listed? Suggest!
Speaking about physiology, one probably shouldn't forget about pharmacology.

Other search terms related to physiology and their ratings are:
★★★★★ pharmacology
★★ masteringa&p
★ anatomy
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Google Trends

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physiology
psychology
anatomy