Physiology

Heart murmurs:
http://www.blaufuss.org/tutonline.html#
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A great animation of the heart cycle:
http://library.med.utah.edu/kw/pharm/hyper_heart1.html

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Kind of ugly ECG Simulator. It's not pretty, but it works!
http://www.skillstat.com/tools/ecg-simulator


Biology reference - Respiration

Spirometry - in Swedish

Neural and hormonal regulation of digestion mind map

Virtual Labs at Stanford

http://www.physiol.med.uu.nl/interactivephysiology/ipweb/home/index2.html