Help the runner maintain homeostasis (click NY for your state):
Thermoregulation:
Homeostasis and Glucose Regulation:
Hormones, Receptors and Control Systems:
http://www.vivo.colostate.edu/hbooks/pathphys/endocrine/basics/index.html
Negative Feedback:
http://www.vivo.colostate.edu/hbooks/pathphys/endocrine/basics/control.html
Negative Feedback and Homeostasis:
http://www.biology-online.org/4/1_physiological_homeostasis.htm
Hormones:
http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/H/Hormones.html
Synapse 1:
http://www.biologymad.com/resources/synapse.swf
Synapse 2:
Synapse 3: