The last electron acceptor gets clogged up and then the acceptor before it and so on until the quinnone pool and the few steps before it all have electrons but without anywhere to drop them off.
It is the supply of oxygen to the heart; the oxygen is carried by the blood. When there's insufficient blood supply, oxygen supply is low too, and angina results. See http://en.wikipedia.org/wiki/Angina_pectoris
angina
Insufficient oxygen supply to the cornea, basically.
due to insufficient oxygen supply to blood stream.
myocardial infarction
any part of the body can die and never work again. That is what die means. It happens when there is insufficient blood supply (carries oxygen and nutrients).
suffocation
Carbon monoxide is produced when a fuel is burning with an insufficient oxygen supply.
It means that there is an insufficient supply of oxygen in the artery. Artery carries oxygen away from the heart.
I think carbonisation is the word, the end result is charcoal.
When Carbon reacts with an insufficient supply of oxygen, bonds form and create CO (carbon monoxide)
Fermentation