To allow for the survival of our earliest ancestors, four different aspects of cardiac function would need to have been working properly.
In the history of life, some forms survive while — or even by — losing information.
When the heart cannot meet the metabolic needs of the body it is said to be in heart failure.
Imagine you are trying to get into a saloon through its swinging door.
Anything HGT does, Darwinian evolution did not do.