<p>Khan Academy's Health and Medicine course is a free, self-paced online library covering human body systems, diseases, and related mental-health topics, including a dedicated unit on brain function and mental health. It is curated here for learners interested in psychology-adjacent medical content.</p><ul><li>Fourteen units spanning circulatory, respiratory, endocrine, nervous, and other body systems, plus a Brain function and mental health unit</li><li>Approximately 112 hours of video and practice material across the course</li><li>Fully self-paced; learners pick units in any order</li><li>Free to access; no registration barrier and no expiry</li><li>Suitable for secondary, pre-U, JC, and polytechnic students, as well as patients and carers</li></ul><p>Khan Academy notes this content is educational and is not a substitute for professional medical advice. Learners start directly from the course page.</p>