Electrocardiography (ECG) is very useful as a research tool for those of use who are concerned about humane slaughter. We have been eating meat for millions of years (otherwise we would not have the dentition we have and unique enzymes such as pancreatic elastase to digest elastin - which does not occur in vegetarian food). However, no person in their right mind wants to cause any unnecessary distress to an animal. Thus, we need to understand the physiology of animals as they are commercially slaughtered.

The basis components of the ECG are:

ECG's recorded in the abattoir look like this:

where it is not too difficult to see P, QRS, and T. However, it gets a lot more complicated....

or, for another example,