Already the Babylonians connected this Zodiac sign and the constellation with the mythological animal, sort of a mermaid goat. They called it the Goat-Fish. The reason for this is hidden in history.
Without an adequate blood supply, the heart muscle is deprived of oxygen and nutrients and waste products manufactured by the cells accumulates in the muscle tissue. Depending on the severity, it may cause myocardial ischemia, which is damage but not death of the muscle due to an inadequate blood supply. Alternatively it may cause death of the muscle tissue which is known as a myocardial infarction (MI).
Scar tissue on the lungs reduces the organ's ability to expand and draw in more oxygen. As a result, when breathing is elevated due to increased activity or elevated heart rate, a person will experience a drop in energy level and tire quickly.