OpenStax
Open Stax: Anatomy & Physiology: Cardiac Cycle
Students learn the structure and function of the cardiac muscle and study the components of the conducting system that distributes electrical impulses through the heart during the cardiac cycle.
Sophia Learning
Sophia: Animals: Human Cardiovascular System: Lesson 1
This lesson provides an overview that explains the cardiovascular system in humans. It is 1 of 4 in the series titled "Animals: Human Cardiovascular System."
Sophia Learning
Sophia: Animals: Human Cardiovascular System: Lesson 2
This lesson provides an overview that explains the cardiovascular system in humans. It is 2 of 4 in the series titled "Animals: Human Cardiovascular System."
Sophia Learning
Sophia: Animals: Human Cardiovascular System: Lesson 3
This lesson provides an overview that explains the cardiovascular system in humans. It is 3 of 4 in the series titled "Animals: Human Cardiovascular System."
Sophia Learning
Sophia: Animals: Human Cardiovascular System: Lesson 4
This lesson provides an overview that explains the cardiovascular system in humans. It is 4 of 4 in the series titled "Animals: Human Cardiovascular System."
US National Library of Medicine
Medline Plus: Blood Pressure
From MedlinePlus, a video tutorial featuring information on blood pressure with accompanying text.
Texas Heart Institute
Texas Heart Institute: Heart Information Center: The Heartbeat
One-page article describes the pumping action of the heart.