Adrenaline

Adrenaline is a hormone and a neurotransmitter. The adrenaline has different functions in the body that regulates heart rate, blood vessels. It is secreted from the adrenal medulla in response to stimulation from sympathetic nervous system. Asgard has no glands in their bodies as not pumps adrenaline through their body.

In 2004 in Teal'c tested a modified virtual reality pod in an exercise program started his adrenaline levels will be increased and the risk of heart attack. Doctor Ian Carmichael gave him an injection of adrenaline to keep his heart started.