how heart working? and how it became week?

Answer 1

The coronary circulation consists of the blood vessels that supply blood to, and remove blood from, the heart muscle itself. Although blood fills the chambers of the heart, the muscle tissue of the heart, or myocardium, is so thick that it requires coronary blood vessels to deliver blood deep into the myocardium. The vessels that supply blood high in oxygen to the myocardium are known as coronary arteries. The vessels that remove the deoxygenated blood from the heart muscle are known as cardiac veins.
The coronary arteries that run on the surface of the heart are called epicardial coronary arteries. These arteries, when healthy, are capable of autoregulation to maintain coronary blood flow at levels appropriate to the needs of the heart muscle. These relatively narrow vessels are commonly affected by atherosclerosis and can become blocked, causing angina or a heart attack. (See also: circulatory system.)
The coronary arteries are classified as "end circulation", since they represent the only source of blood supply to the myocardium: there is very little redundant blood supply, which is why blockage of these vessels can be so critical.

As far as weak heart is concerned, if it is afraid of talking to a girl, then it is yours brain, which is not allowing you to open up.

Answer 2

This first question is completely answered in a 1st year medical physiology course. The second question is completely answered in a 2nd year pathology course. There are a number of causes of weakness - heart attack, infections, trauma, latent birth defects.

Can you narrow down what you are looking for?

Answer 3

I work on a cardiac floor but I would need to know more details than this. Did you have a heart attack? An infection? Do you have a heart murmur?