Free online course Human Physiology Lecture

About the free online course

Understanding how the human body works is more than memorizing facts—it is learning the logic behind life processes, from how cells create energy to how the brain stays protected. This free online course in human physiology helps you connect core principles across the body, so concepts make sense as a system rather than as isolated topics. Whether you are preparing for further study in health fields or simply want a clearer picture of what is happening inside you every day, the course builds confidence through explanation, repetition, and applied practice.

You will start by clarifying the difference between anatomy and physiology, then move into the chemical building blocks that shape structure and function. You will explore how carbohydrates, lipids and cholesterol relate to energy, membranes, and signaling; why amino acids and proteins matter; and how nucleotides, vitamins, and other compounds support cellular work. As ideas build, you will tie chemistry to real physiology: metabolism and cellular respiration become understandable as coordinated steps that transform nutrients into usable energy, with oxygen playing a crucial role.

The course also strengthens your ability to reason about how information flows in the body—starting with genes and extending through transcription and translation to protein synthesis. From there, you will examine cell membranes as dynamic barriers, learning how diffusion and osmosis influence movement of water and solutes. These topics set the stage for fluid compartments in the body and practical thinking about total body water, which is essential for interpreting hydration, balance, and many clinical discussions.

Finally, you will see how physiology protects stability through homeostatic reflexes, including the role of receptors and feedback. You will consider temperature regulation, inflammation and fever as responses to stress or injury, and connect endocrine timing to the menstrual cycle. To round out the experience, you will take a guided look at nervous system organization and the protective structures of the central nervous system, including how cerebrospinal fluid supports brain function. Throughout, short exercises and questions help you check understanding and strengthen recall, turning passive watching into active learning you can use.