A heart attack occurs when the flow of blood to the heart is blocked, most often by a build-up of fat, cholesterol and other substances, which form a plaque in the arteries that feed the heart (coronary arteries). The interrupted blood flow can damage or destroy part of the heart muscle. A heart attack, also called a myocardial infarction, can be fatal, but treatment has improved dramatically over the years. It's crucial to call 911 or emergency medical help if you think you might be having a heart attack.
Irises are classified as being one of six colors: amber, blue, brown, gray, green, hazel, or red. Often confused with hazel eyes, amber eyes tend to be a solid golden or copper color without flecks of blue or green typical of hazel eyes. Blue eyes have a low level of pigment present in the iris.
Brown eye color used to be considered dominant, but scientists have now revealed that eye color is actually a multi-gene trait, rather than a single gene one. Itâs a little bit more complicated than to simply say that the brown eye color is the dominant one. Itâs more of a gene combination. Itâs also genetically possible to have your eye color divided into two colors on your iris, or different color irises.