Heart

The semilunar valves prevent backflow into the ventricles. The pulmonary semilunar valve prevents backflow in the right ventricle, and the aortic semilunar valve prevents backflow of blood in the left ventricle.

Stress, eating, and exercising can influence tachycardia. Any heart issues should be checked out by a doctor as soon as possible so it can't to lead to any damage.

To keep the cardiac output equivalent, when stroke volume decreases, the heart rate increases. Any sympathetic nervous system response which releases chemical stimuli such as epinephrine and norepinephrine.

So that it can oxygenate the blood before going round the rest of the body

The heart has two contraction cycles, one is the systole and the other one is the diasole. Both are fired by one impulse from the Cranial Nerve X. The delay required for the ventricles to contract are a result of the atrrioventricular node that pauses the impule until the ventricles are filled with blood.

In response;No, there are no valves in the trachea.

There is infact a valve in the trachea,created by 'cricopharyngeous muscle'.Its role is to stops food entering your airway when eating. hence the saying ' its gone down the wrong hole' when you swallowing something and it makes you cough!!

Yes, the prefix in the word epicardium, epi- means outer, which in this case is the outer layer of the heart.

Yes it does. It starts within seconds of snorting the cocaine, and lasts for several hours. Depending on how much you do and how long. I should know my heart rate is rather increased right now, and yes I did take the drug. Don't ever get into it. It's not healthy. My best friend nearly had an overdose last night.

If you fix your eyes on the color red, your heart will beat faster.

A 13 month old should have a heart rate between 80 and 130 beats per minute. This is what they should be at while at a resting point.

Abnormal heart sounds called murmurs are usually a result of faulty valves. For example, an incompetent valve fails to close tightly, so that blood leaks through the valve when it is closed. Another example, an incompetent bicuspid valve produces a swishing sound immediately after the first heart sound.

The human heart is a remarkable organ. Slightly larger than a human fist the heart must continuously beat over person's lifetime. Beating 80,000 to 100,000 times and pumping approximately 2,000 gallons a day the heart will have beat 2-3 billion times and pumped 50-65 million gallons of blood over a 70-90 year lifespan. The human heart is made of specialized muscle capable of sustaining continuous beating. This muscle is different than skeletal muscle that powers the arms and legs. Not being anywhere near an expert, this answer will be a layman's recollection, hopefully to be corrected when finally improved by an expert. I think that the blood passing through th right atrium is being returned from throughout the body meaning that it is high in carbon dioxide, and has reduced oxygen content. The right side of the heart pumps this blood tthrough the lungs where the CO2 is removed, and the oxygen level is replinished. The "cleaned up" blood then goes from the lungs to the left side of the heart which then pumps it out through the arteries to the rest of the body.

Blood returns from the lungs after collecting oxygen, via the Pulmonary Vein to the Left Atrium. Then is pushed through to the Left Ventricle where it is pumped around the body with its fresh supply of oxygen leaving the heart via the Aorta. Hope this helps.

listen up

2 things i know about the heartburn thingy whatever

it affects the ugly digestive system

And

it has NOTHING to do about the freakin' heart

Okay theres your REASONS

Blood flows to the lungs through the pulmonary trunks which divides into the right and left pulmonary arteries. These transport blood to the air sacs of the lungs, where carbon dioxide in unloaded and oxygen is picked up. Then the blood flows back to the heart by the pulmonary veins.

Mitral regurgitation or tricuspid regurgitation is the medical term meaning backflow of blood through the mitral or tricuspid valves, respectively.

The left ventricle is the main pump for the movement of blood throughout the body. It receives blood from the left atrium and then pumps it out through the aortic valve into the aorta and to the rest of the body.

Pectinate muscles

Well the pulmonary veins carry oxygenated blood from the lungs to the left atrium of the heart but the cardiac muscle itself receives oxygenated blood from the coronary arteries.

The left ventricle

This is because it has to contract against the highest resistance, the aortic pressure and systemic vascular resitance. Hence left ventricle also has the thickest muscle of the lot.

right ventricle

Atrial fibrillation is where the electrical impulses within the atria become very rapid and irregular. Atrial rates are usally between 300- 400 BPM or more. How it can happen: 1) Electric shock 2) ion imbalance within heart cells 3) Re- entry pathway. For more information please contactHeartquestionsanswerd@hotmail.co.uk We will answer your question for FREE however use this information as a guide ONLY. I am NOT a doctor but I have been studying the heart for many years and the information here is up=to date.
Fibrillation is a medical term and refers to the quivering of a muscle, usually in the heart, as opposed to it contracting properly. Due to uncoordination of the muscle fibrils. Common terms heard are atrial and ventricular fibrillation, the first meaning that the atria of the heart (chamber that fills with blood) is not working well. When ventricular fibrillation occurs, only a small amount of blood is pumped out of the heart. This is the more serious of the two conditions.

Generally, no. There are rare cases when the heart appears on the wrong side of the body, but in the vast majority of cases all human hearts are on the left (although the actual position of the heart is fairly central, it lies obliquely to the left with the ventricles on that side).

1, 2, 19, 38, 361, 722 | 1 x 722, 2 x 361, 19 x 38.

yes because my grandfatherhad one and he woke up and he had heart problems