Argon gas: An inert gas present in the atmosphere in minute quantities which can be used for stunning.

Carotid arteries: The major arteries that supply blood to the head.

Cortical responsiveness: Responsiveness of the brain.

Cortisol: A hormone which is produced by the adrenal glands and appears in response to stress.

Dressing procedures: Removing the skin, head, feet and intestines from an animal.

Exsanguination: The period when an animal bleeds to death.

Evisceration: Removal of the internal organs of an animal - same as disembowelling.

Impedance: Resistance to a flow of electricity.

Jugular: Large vein in the neck that carries blood to the heart from the head.

Pithing: The insertion of a wire or rod through the hole in the head made by the captive bolt pistol to destroy the lower part of the brain and the spinal cord.

Stunning: Using electricity, gas or a bullet in an attempt to cause immediate unconsciousness.

Stun-to-stick interval: The time interval between stunning and knifing an animal.

Sticking: Sticking a knife into the throat or chest of an animal so that s/he bleeds to death.

Thoracic stick: Using a knife to sever all the major blood vessels near the heart.

Ventricular fibrillation: Uncontrollable twitching of the heart muscle fibres.