Physiology refers to the:

• A. Anatomy
• B. Functioning of your body parts
• C. Brain structure
• D. Pathology

Answer: (B)

Physiology is about how the body's parts perform their functions and work together to keep you alive. It studies the processes that enable life—how the heart pumps, how nerves transmit signals, how muscles contract, and how organs coordinate to maintain balance. That focus on functioning is why the answer describing the functioning of your body parts is the best fit.

In contrast, anatomy is the study of structure—what organs are, and where they are located. Brain structure is an example of anatomy. Pathology, on the other hand, looks at disease and how it disrupts normal function, rather than describing normal functioning itself.