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What is physiology the study of?

  1. Microbial life forms

  2. Functions and activities performed by the body's structures

  3. Human psychology

  4. The structure of human bones

The correct answer is: Functions and activities performed by the body's structures

Physiology is the study of the functions and activities performed by the body's structures. Option A is incorrect because microbiology is the study of microbial life forms, which are microscopic organisms. Option C is incorrect because psychology is the study of the mind and behavior, not the body's structures. Option D is incorrect because anatomy is the study of the structure of human bones, while physiology focuses on the functions and activities of those structures.