1. the branch of biology that deals with the functions and activities of living organisms and their parts
2. the bodily processes and functions of an organism or any of its parts

Examples

• She studied human physiology in medical school.
• The physiology of the heart involves complex electrical and mechanical processes.
• Plant physiology examines how plants absorb nutrients and produce energy.
• Understanding muscle physiology helps athletes improve their performance.
• The course covered both anatomy and physiology of the digestive system.
• Exercise physiology focuses on how the body responds to physical activity.