Heart

Most heart function changes occur due to aging. These changes include a slowing heart rate, a swelling of the heart, and the degeneration of the heart muscle.

Leonardo Da Vinci did. He said it had the appearance of a bishop's mitre. Leonardo Da Vinci did. He said it had the appearance of a bishop's mitre. Leonardo Da Vinci did. He said it had the appearance of a bishop's mitre.

Starting at week 5 the fetal heart will accelerate at a rate of 3.3 beats per day for the next month. The fetal heart begins to beat at approximately the same rate as the mothers, which is 80 to 85 bpm. Below illustrates the approximate fetal heart rate for weeks 5 to 9, assuming a starting rate of 80 Week 5 starts at 80 and ends at 103 bpm Week 6 starts at 103 and ends at 126 bpm Week 7 starts at 126 and ends at 149 bpm Week 8 starts at 149 and ends at 172 bpm At week 9 the fetal heartbeat tends to beat within a range of 155 to 195 bpm. The fetal heart rate will begin to decrease and generally will fall within the range of 120 to 160 bpm by week 12

Mostly blood, and some plasma.

The wall of the ventricles is thicker than the walls of the atria as they have to be stronger as they have to pump the blood around the body where as the atria only have to pump blood into the ventricles

The heart is made up of four chambers. Two atria (top half) and two ventricles (bottom half) The right atrium receives unoxygenated blood from the body and pushes it into the right ventricle. The right ventricle then pumps the unoxygenated blood to the lungs where it is oxygenated. The left atrium then receives this newly oxygenated blood from the lungs and pushes it into the left ventricle which then sends the blood (with lots of oxygen for the body to use) to the rest of the body. The blood from the body then returns to the right atrium and the cycle starts all over again.

So the blood can be fully cleaned and filled with oxygen so the human body can use the blood again

The membrane that protects the heart is called the pericardium.

It has two layers:

- the visceral pericardium (the inner layer which touches the heart)

- the parietal pericardium (the outer layer which touches other organs)

Yes, directly related. When the heart beats it pushes blood around the body. You can feel a pulse as the blood moves around the body at a variety of places (the neck, the wrist, the top of the leg). The pulse you can feel is from the blood being pushed every second or so - but the heart. The pulse rate is the same as the heartbeat rate.

The normal, or natural, pacemaker of the heart is the sinoartial node, it passes the action potential to the ventricular node, which slows it down long enough for the ventricles to fill up with blood. Then the second contraction is triggered by the action potential traveling down the Bundle of His, or atrioventricular bundle, and then spread out the signal to the Purkinje fibers which transmit the action potentiall to all parts of the ventricles.

The flow of blood in the heart is determined by the pressure differences between the chambers. If there is no pressure difference, there will be no flow. The valves control the direction of flow.

Around 210 BPM.

The normal formula for this is (220 - age = maxBPM).

At present, there is no cure for heart disease. the cure for heart disease is probably on the horizon with the pace of advancement in medicine. You can't cure heart disease, you can only treat it and prevent it getting worse. if you have heart disease the best thing you can see a doctor or a heart ;-p ;-) xxx

answer from I LOVE JLS xxxxxxxxxx

I fink the blood vessel are taking the blood from are hearts to the lungs so the lungs can give oxagen to us so we can breath.

Its...........

Aorta, Left pulmanory vein, Left atrium, Left ventricle,vena cava, Right pulmanory vein, Right atrium, Right ventricle.

I think

The semilunar valves open when the pressure in the ventricles excedes the diastolic pressure in the artery the ventricle empties into. For example if the diastolic pressure in the aorta is 80 mmHg then the aortic similunar valve will open when the pressure inside the left ventricle surpasses 80 mmHg.

A combination of things causes the heart to pump and several conditions can interfere with the heart pumping. However, the left ventricle is the workhorse of the heart. It is said, in figuring comparisons, the heart can shove a steamship up on the beach it is so strong.

We have 3 electrical nodes (to simplify explanation) in the heart, one at the top, one at the bottom, one in the middle. Electrical impulses travel from one to the other causing the heart impulses. It is said heart muscle will beat on its own even in a lab setting it is so "electrical". As the heart depolarizes from these nodes it "beats".

We all have a natural "pacemaker", located in the right atrial wall of the heart. This "pacemaker" sets the heart's "sinus rhythm" of 70-80 bpm. Heart muscle is different from any other in the body.

PACEMAKER

the heart is in the same position in both males & females...it lies beneath the left breast-approximately.

Corronary circulation, via the left and right coronary arteries. These are the first branches off the ascending aorta and sub divide into the left anterior descending and the right posterior descending. These further divide into the marginal and thecircumflex branches. These feed all the major areas of the heart.

The superior and inferior vena cava deliver blood from the body into the heart, the aorta brings blood from the heart into the rest of the body.

The left ventricle of the heart has the greatest muscular thickness as it has to pump the furthest distance (systemic circulation).

The thyroid gland does influence the proper function of many important body organs including the heart. For those with a thyroid condition, too much or too little production of thyroid hormones can effect the heart rate. For example, a symptom of hyperthyriodism (overactive thyroid) can be a fast or irregular heart beat.

After leaving the systemic veins, blood enters the heart to be pumped to the lungs. There is gives up its carbon dioxide, takes in oxygen, enters the heart again, and is pumped to the body through the arteries.

the thinnest wall of the heart is the one supplying heart to the lungs ie : the left side. the thinnest wall of the heart is the one supplying heart to the lungs ie : the left side.