See It · The Heart

Heart Walkthrough

How the heart is built, how blood moves through it, how each beat starts, and how much it pumps. Go at your own pace. Nothing here is graded.

Speed

Think of it like this

Quick check

Wrong answers are fine here. Read why, then try again.

Dr. Akash Garg · See It: Anatomy & Physiology · Chapter 19, The Cardiovascular System: The Heart (OpenStax Anatomy & Physiology 2e) · Use the left and right arrow keys to move between steps. Practice next in the Heart Lab.
Diagrams are simplified and not to scale. Oxygen-poor blood is drawn blue only as a label (all blood is red). The heart drawing is an original simplified frontal section; the great vessels are straightened, only two pulmonary veins are drawn on most views, and most animations are slowed down so you can watch them. Pressures, volumes and timings are rounded textbook values for a resting adult at about 75 beats per minute.