What is the number of coronary arteries in the heart?

Many. There are major vessels: right coronary artery and left main coronary artery that divides into the left anterior descending artery and left circumflex artery. Each of these may have 3-7 branches that vascularize the heart muscle.
Three. There are three coronary arteries feeding the heart. They are not much wider than spaghetti, so they can get clogged easily. They must provide continuous oxygen and nutrients to the heart which is the size of your fist and beats 100, 000 times a day every day of your life.

Related Questions

What do coronary arteries provide to the heart?

Blood supply. The coronary arteries provide the blood supply (oxygen & nutrients) to the heart. Read more...
Blood. Your heart (especially the left ventricle) is a thick muscle and needs a rich, constant supply of oxygen and nutrients. These are supplied by by the coronary arteries as the left ventricle is not able to absorb them from the blood pool inside the cardiac chamber. Read more...

Which part of the heart is affected by occluding the following coronary arteries?

See below. Lad ("left anterior descending" artery)--affects anterior (front) wall of the left ventricle, and apex (the tip). Circumflex artery--affects the lateral wall of left ventricle, and usually part of the posterior (back). Right coronary artery--affects inferior (bottom) wall of left ventricle and all of the right ventricle (if occluded proximally enough in its course). Read more...
See below. Note: these are general as anatomy differs in individuals - left main: the entire left ventricle; left anterior descending: the interventricular septum, anterior wall/lateral wall. Sometimes parts of the inferior wall. Circumflex (if non-dominant): the lateral wall; right coronary artery: the right ventricle, atria, lv inferior/posterior/and lateral walls. Dominant lcx:see rca, . Read more...

Can you tell me how the heart know to take blood from the coronary arteries?

Pressure. The blood moves from an area of higher blood pressure to an area of lower BP. That's why, in order to be alive, you must have blood pressure! Read more...

"left" and "right" coronary arteries I just hade a heart cath it look clear just left one is thinner than the other is that normal?

Coronary arteries. It is not unusual to have some discrepancies in arterial diameters. Maintain a healthy weight, manage your cholesterol aggressively to normal levels, eat healthy diet and exercise regularly. See your doctor regularly. Read more...
Yes. More than likely you have the larger vessel system that is dominant .That is normal. Read more...