https://www.coursera.org/learn/physiology Coursera is currently enrolling students for a free introduction to Human Physiology taught by professors at Duke University. In this course, students learn to recognize and to apply the basic concepts that govern integrated body function (as an intact organism) in the body's nine organ systems. The course is 22 hours of videos and assessments. This course is offered with the option to get a certificate that can be shared on LinkedIn. The certificate for this course is co-branded by Coursera and Duke University.