Heart

A heartbeat is too fast when you just finished performing a strenuous exercise... Its beating too fast I think because it needs to pump the oxygenated blood all over the body... That's why you always catch your breath or breathe continuously :))

Sometimes it also happens when you are in front of "your crush" wherein the case is you intend to blush and freak out ^_^

It also happens when you're nervous... not only fast but loud heartbeat :)

-based on my experiences

They connect the papillary muscles to the tricuspid valve and the mitral valve in the heart.

also i like bananas :)

No.

The wall of the left ventricle is much thicker. The left ventricle pumps blood through the systemic circuit, which travels though the entire body, excluding the lungs, returning to the right atrium. This requires overcoming the various resistance factors within the blood vessels including, but not limited to, distance traveled by the blood, gravity, and vessels with a narrow radius. To generate the necessary pressure, the muscle, or "wall" of the left ventricle, is much thicker, and therefore much stronger.

The right ventricle pumps blood through the pulmonary circuit (to the lungs and back to the left atrium) which is much shorter and less complex, and therefore requires much less pressure and far less muscle.

Typically a normal resting pulse rate for a healthy 18-year-old could be within 60-80 pr. minute. This varies with the physical condition this person is in.
A top athlete will, as an example, have a lower resting pulse than most normal individuals.
Also typically a womans resting pulse rate will be higher than a males resting pulse rate.

No, visceral pericardium attached to the surface of the heart.

The parietal pericardium attached to the wall.

1. from systemic system (deoxygenated)
2. through venae cavea
3. into right atrium
4. through tricuspid valve
5. into right ventricle
6. out through pulmonary artery
7. to pulmonary system (oxygenated)
8. back to heart through pulmonary vein
9. into left atrium
10. through bicuspid valve
11. into left ventricle
12. through aorta and back to systemic system

it has two separate parts because when the blood circulates around you're body, it needs to get pass other blood cells so it goes in the other part of the heart!!! XD play ourworld!! XD

one side is for oxygenated blood and the other for deoxygenated blood. They also both do different things. Simone :)

with electrocardiography and auscultation different abnormalities can be detected. For example, ecg can show abnormal rythms (due to the damage to the conductive tissue or high level of potassium). But cardiac mummurs can only be heard (they're because of valvular problems)

Usually when people reference the heart to something it is relating the size of it to your fist.

Yes. This is a congenital condition called situs inversus (or situs transversus). In this condition, "everything works" but the visceral organs are all located "mirror image" to what is "normal" in people. Need a link? You got it.

The left atrium pumps blood through the atroventricular valve(tricuspid valve) into the right atrium,then through the semilunar valve into the pulmonary artery to the lungs for gaseous exchange.

The epithelial tissue protects the main organ (the heart) from rubbing and damaging the lobes in the heart against the lungs it provides an extra barrier for security and saves the heart from injuries to the upper body around the heart area.

Very poorly. Let's consider the left side of the heart which pumps blood into the aorta, the main artery leading from the heart. At the peak of a contraction (squeeze) of the heart it pumps blood into the aorta. The aorta is very elastic and expands as the squeeze of the heart pushes blood into it. Some of the blood, of course, continues on, and under normal circumstances, the aortic valve then closes, and as the heart fills with blood for the next squeeze, the elasticity of the aorta shrinks the aorta and pumps more blood into the body. If the valve is damaged (or, in your question, absent) then as the aorta's elasticity shrinks it, the blood would be forced back into the heart, not letting new blood come in to be pumped out on the next contraction. Thus the pumping would become very inefficient. It is exactly because of damage like this (aortic insufficiency) that the valve sometimes has to be replaced.

Of course heart muscles need a blood supply for the cellular respiratory process as the blood carries the final electron acceptor oxygen which is key to oxidative phosphorylation in humans.

if blood entering the heart gets mixed with blood leaving the heart the the blood leaving the heart will get poluted. the blood entering the heart is poluted when it enters the heart, the heart cleans it up; so when the blood leaves the heart it is clean so if it gets polluted the person may get sick and this leads to his/her death.

The normal heart rate for adults is between 60-100 beats per minute. However, medications and certain conditions can raise and lower your normal pulse rate. Additionally, people who are very physically fit sometimes have a much lower resting heart rate. See your doctor to determine what a proper heart rate is for yourself personally.

Cardiothoracic means pertaining to the heart and lung cavity.

The left ventricle forms the apex of the heart.

Blood enters the heart through the superior and inferior vena cava. These two paths dump deoxygenated blood into the right atrium. Blood passes from the right atrium through the tricuspid valve into the right ventricle. The right ventricle contracts and forces the blood through the pulmonary semilunar valve into the pulmonary arteries. The blood moves into the lungs and gas exchange occurs, oxygenating the blood. The blood then moves through the pulmonary vein, emptying into the left atrium. The oxygenated blood then passes through the bicuspid valve into the left ventricle. The left ventricle contracts and forces the blood out through the aortic semilunar valve and into the aorta. The aorta is the bodies largest artery and blood is distributed to smaller arteries and out to the entire body (except the lungs).

Remember simply:

Body -> Vena Cava -> Right Atrium -> Tricuspid Valve -> Right Ventricle -> Pulmonary Semilunar Valve -> Pulmonary Artery -> Lungs -> Pulmonary Vein -> Left Atrium -> Bicuspid (Mitral) Valve -> Left Ventricle -> Aortic Semilunar Valve -> Aorta -> Body

If you can remember this, remembering heart anatomy and understanding how the heart works is very simple.

there really isn't any such thing as an ischaemic artery (it can happen, but I've never heard of it!). Rather ischemia (or ischaemia for our English and Australian friends) is a lack of sufficient oxygen delivery to a tissue. Oxygen is carried by HEMoglobin in the blood hence the iscHEMia. Ischemia is usually caused by an interruption to the blood flow to a particular area. One way to interrupt blood flow is to block an artery. (which usually deliver oxygenated blood to tissues) A blockage may be the result of a plaque (a fatty aggregation on the inside walls of an artery), or a thombus (clot), or an embolus of some sort. People often hear that they may have ischemic heart disease. This is a condition of severely narrowed arteries (often greater than 70% of their cross sectional area may be blocked) which leads to decreased blood (and hence oxygen) supply to the muscle of the heart. This can cause Angina. If the coronary arteries completely block off, then a heart attack will ensue, where cardiac muscle dies because of lack of oxygen. Treatment ranges from medications to: lower cholesterol, decrease oxygen consumption of the heart, vasodilators to increase delivery of blood through that artery; to surgery to operate and either re-open the blocked vessel (balloon angioplasty and stenting ) or procedures to essentially replace the diseased vessels in By-pass surgery (CABG- coronary artery bypass grafting). Hopefully that helps!! Aj :)

Excessive saturated fat intake increases the risk of heart disease by increasing triglyceride and LDL (low density lipoprotein) levels. Cholesterol can deposit in blood vessels, clogging them and causing heart disease.

Unsaturated fats can reverse this process.

The baby's heart begins to beat at about five weeks after your last menstrual period, or three weeks after conception. It can be visualized with an ultrasound, but not heard with a Doppler until later in the pregnancy.