A healthy heart is necessary for a long and healthy lifestyle.

There are many things that could go wrong with the heart, and once in a while the symptoms that something is wrong are not continually obvious. A cardiologist is a health practitioner who focuses on diagnosing troubles with the heart.

Heart Function
The human heart is an organ that pumps blood at some point of the body via the circulatory system, supplying oxygen and vitamins to the tissues and getting rid of carbon dioxide and different wastes.

Human Heart Size and weight
The heart is roughly the size of a large fist and weighs between about 280 to 340 grams (10 to 12 ounces) in men and 230 to 280 grams (8 to 10 ounces) in women.

Human Heart Chambers

The human coronary heart has four chambers: two higher chambers (the atria) and two lower ones (the ventricles), in keeping with the National Institutes of Health. The proper atrium and proper ventricle collectively make up the "right heart," and the left atrium and left ventricle make up the "left heart." A wall of muscle called the septum separates the 2 sides of the heart.

Heart Walls
The heart's outer wall consists of three layers. The outermost wall layer, or epicardium, is the inner wall of the pericardium.  The middle layer, or myocardium, 
contains the muscle that contracts. The inner layer, or endocardium, is the lining that contacts the blood.

Heart Blood Function/system

The heart circulates blood thru two pathways: the pulmonary circuit and the
systemic circuit. In the pulmonary circuit, deoxygenated blood leaves the right ventricle of the coronary heart through the pulmonary artery and travels to the lungs then go back as oxygenated blood to the left atrium of the coronary heart thru the pulmonary vein.
In the systemic circuit, oxygenated blood leaves the frame thru the left ventricle to the aorta, and from there enters the arteries and capillaries where it elements the frame's tissues with oxygen. Deoxygenated blood returns through veins to the venue cavae, re-entering the coronary heart's right atrium.

Heart Electrical Function/system
The heart contains electrical "pacemaker" cells, which cause it to contract to produce a heartbeat.

To pump blood in the course of the body, the muscle mass of the heart need to be coordinated perfectly squeezing the blood in the proper direction, on the proper time, at the right pressure. The heart's interest is coordinated with the aid of electrical impulses.
The electrical signal starts at the sino-atrial (or sinus, SA) node the heart's pacemaker, located on the top of the proper atrium. This sign reasons the atria to contract, pushing blood down into the ventricles.
The electrical impulse travels to a place of cells at the lowest of the proper atrium known as the atrioventricular (AV) node. These cells act as a gate; they slow the signal down in order that the atria and ventricles do no longer contract on the equal time there needs to be a mild delay.

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