Muscle Physiology

Simple animations on muscles and neuro-muscular junctions. Good if you're tired of reading. It's narrated :)

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

Tibetans Adapt to High Altitude

Here is an interesting article on oxygenation when at high altitudes!

Evolving altitude aptitude

Heart murmurs

These are the most common heart murmurs.

Surfactant

Surfactant is produced in the developing babies lungs. In week 35 most babies have enough to have fully functional lungs. It consists of fosfolipids and proteins. The proteins have antibacterial properties. The fosfolipids reduce the surface tension in the alveoli. When we exhale, the surfactant concentrates which decreases surface tension and prevents the alveoli from collapsing. When we inhale, the surfactant dilutes which increases the surface tension. This mechanism helps even out alveoli size during breathing, which allows for maximum oxygenation.

Physiology training software

Stanford University has really made a good site on physiology. Simple and with practice quizes. Very useful and to the point.

Virtual Labs at Stanford

Here is a link on respiration. It sums it up neatly!

Respiration