What is the study of the functions of the human body called?

• A. Physiology
• B. Anatomy
• C. Pathology
• D. Biochemistry

Answer: (A)

Physiology is the study of how the human body functions. It looks at how organs and systems work together to keep a person alive, from how the heart pumps blood and the lungs exchange gases to how the kidneys filter wastes and how nerves and hormones regulate activity. A central idea is homeostasis—the body's ability to maintain stable conditions despite changes around it. This focus on function and processes differentiates physiology from anatomy, which studies structure and location; pathology, which examines disease; and biochemistry, which explores chemical reactions in living systems.