Free online courseThe Circulatory System

Course Description

Understanding how blood moves through the body is one of the fastest ways to make anatomy feel clear, connected, and clinically meaningful. This free online course on the circulatory system helps you build a solid mental map of cardiovascular anatomy, from the structure of the heart to the pathways that deliver oxygen and nutrients to every region. You will learn to recognize key vessels, follow flow step by step, and connect what you see in diagrams and models to real physiological purpose.

Start by strengthening your grasp of the heart itself and the logic behind one-way circulation, including the structures that prevent backflow and keep blood moving efficiently. From there, you will trace pulmonary circulation and systemic routes, distinguishing what happens in the lungs from what happens throughout the rest of the body. The course also highlights coronary circulation so you understand how the heart muscle receives its own blood supply and why that matters for function and health.

As you progress, you will work through arterial and venous anatomy across multiple regions: head and neck vessels, major branches from the aortic arch, thoracic and abdominal circulation, and the upper and lower limbs. You will also explore clinically important networks such as the Circle of Willis, linking anatomical patterns to outcomes like ischemic stroke risk when certain arteries become occluded. Special focus on organ models for the liver and pancreas helps you see how regional circulation supports digestion and metabolism.

Practice questions throughout the course reinforce recall and decision-making, helping you move beyond memorization to confident identification and reasoning. Whether you are preparing for exams in health programs, refreshing foundational knowledge, or building a strong base for clinical studies, you will finish with a clearer, more usable understanding of circulatory anatomy and blood flow.