Cardiovascular (Biology)
Fantastic shockwave animation of the heart as a pump 
This animation will take you through each of the different phases of cardiac contraction and relaxation. This includes Atrial systole -> isovolumetric ventricular contraction -> rapid ventricular ejection -> reduced ventricular ejection -> isovolumetric relaxation -> rapid...
Diagnostic Serum Enzymes
I like this site for its description of creatine phosphokinase (CPK) and lactate dehydrogenase (LDH) which are indicators of MI at high levels. Quick overview that is good for basic understanding.
Heart Embryology Video
This is Dr. Richard Blandau's classic animation on development of the heart. Dr. Blandau (1911-1998) was renowned for his basic studies of ovulation, fertili...... I like this link because it was really hard for me to visualize how the heart tube folded into the fetal heart, it was...
Cardio vascular Vessel, Pressure, and Flow Questions
A nice little question bank on the cardiovascular system. It is mainly physiology but also has some histology.
Mechanism for blood clotting animation
This video describes hemostasis mechanism. It is accurate, and fairly complete in its description. It goes over the roles of platelets, Von Willebrand Factor, the intrinsic and extrinsic pathways to clotting and fibrin cross-linking. Really well done for a quick review.
A method to help visualize the Fick Principle
Fick's principle is grounded in mathematics, and is generally difficult to visualize. This Harvard teacher designed a smart way to help you see how the changes in Blood flow, Volume of O2 used and change in concentration of O2 in red blood cells affect each other. Just as a reminder, Fick's...
Lipoproteins Including HDL and LDL
This site helped me to understand the differences between our lipid transport systems. I like its discription of the differences of HDL and LDL - made it really simple and the images are nice to have. It is not completely detailed but good for the basics.
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