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Heart
The heart is a major organ of the body that is found in the circulatory system. It pumps blood throughout the blood vessels. Questions related to the heart should be put here.
8,781 Questions
What happens to A V valves during ventricular contraction?
As the ventricles of the heart contract the pressure in the ventricles rises beyond that of the atria. This pressure differential causes the AV valves to shut.
Why does caffeine makes the heart beats faster?
Well, to be specific, caffeine (like most psychoactive drugs) exerts its effect on us by altering the activity of some of our neurotransmitters. Neurotransmitters are the nervous system's way of conveying messages between neurons, and also to muscle tissue. Some neurotransmitters that caffeine is known to increase the activity of are norepinephrine, dopamine, and serotonin. The increase in norepinphrine is likely what causes the heart rate to increase, however each of these neurotransmitters has some stimulatory effects. Norepinephrine, however, is a powerfully stimulating neurotransmitter; it is associated with the 'fight or flight' response, which of course includes an increased heart rate. I believe it may effect epinephrine as well, which is similar to nor epinephrine except that it is also a hormone (and a neurotransmitter). This means it has both short and long lasting stimulatory action.
What is considered a low heart rate for a 70 year old man?
The normal heart rate for women is 75-80 beats per minute. That does not mean that every healthy woman has to fall in that range, especially if she is an athlete. If a woman does endurance training, or 'cardio', she may have a heart rate as low as 60 beats per minute, and that would be considered normal for her.
What is the heart chamber that receives blood from the venae cavae?
Comes from the Superior and inferior Vena Cava, into the right atrium, through the Tricuspid valve, through the right ventricle through the Pulmonary Semilunar Valve into the pulmonary arteries (-O2) to the lungs, back from the lungs, through the pulmonary veins (+O2) into the left atrium, through the Mitral valve (bicuspid) into the left ventricle up through the Aortic Semilunar valve and out the aorta to the rest of the body.
Anything to the heart is a vein, anything away from the heart is an artery.
If you want to get technical, both Atriums receive "venous" blood, difference is the left receives oxygenated blood and the right doesn't.
The heat pumps and sends the blood to different parts of the body. The heart beating looks like the pump.
How long does it to die from a stab wound?
Assuming there is no penetration of the brain, it would take anywhere from a minute (if a major artery or vein is severed such as the jugular vein in the neck or the aorta in the chest), to months from infections. It depends on what part of the body got stabbed.
It also depends on whether or not the stabbing instrument was removed from the wound or left in. If it is removed the wound will hemorrhage and blood will flow out which increases the rate of blood loss, while if the instrument is left in the victim will last a little longer.
One does not necessarily die from a stab wound. In fact, many people recover.
What valve of the heart has three valves with chordae tendineae?
No, only the atrio ventricular, or the the tricuspid and bicuspid valves, have heart strings
Why does blood in the left ventricle contain more oxygen then the blood in the right ventricle?
This is because the blood in the left atrium has just returned from the lungs, which means that the haemoglobin has joined with the oxygen to form oxy-haemoglobin. This blood is then pumped out of the heart and circulated out of the body.
The blood in the right atrium has returned from the body, which means that the oxygen that was previously present in the blood has been absorbed, and therefore is lacking oxygen. This means that the blood in the left atrium is richer than that of the blood in the right.
The mitral valve is also known aswhat other valve?
Bicuspid valve. It is situated between the left atrium and the left ventricle. It permits blood to flow one way only, from the left atrium into the left ventricle.
What fluid is found in the ventricles of the brain?
Cerebrospinal fluid (CSF) is found in the ventricles of the brain.
Why is smoking terrible for your heart?
Cigarettes contain many chemicals, but two in particular are linked with heart disease - carbon monoxide and nicotine.
What is located closest to the center of the heart?
The heart is about the size of your fist and is located sub-sternal, center thoracic, superior to the stomach with the apex on the left.
In English, it is behind and slightly to the left of your breastbone.
A leaky valve is a condition in which the blood flow is altered by a valve that allows blood to flow backwards, otherwise known as "regurgitation".
Regurgitation can negatively impact the flow of blood across each of your four heart valves - aortic valve, pulmonary valve, mitral valve and tricuspid valve.
Ultimately, leaky heart valves force the heart to "work harder" as it re-pumps blood through a valve. Over time, this can lead to several leaking heart valve symptoms and an enlarged heart.
Some of the most common symptoms of leaky heart valves are:
- Shortness of breath, especially with exertion or when you lie down
- Fatigue, especially during times of increased activity
- Cough, especially at night or when lying down
- Heart palpitations - sensations of a rapid, fluttering heartbeat
- Swollen feet or ankles
- Heart murmur
- Excessive urination
- Chest pain (angina) or tightness
- Feeling faint or fainting with exertion
- Dizziness
Leaking heart valve symptoms do not always appear, or manifest, simultaneously for a patient. Many patients can be asymptomatic even though they suffer from mild, moderate, or even severe, heart valve disease.
If you are experiencing symptoms, it's important to know that there are a number of different heart valve diseases and valve defects that could trigger leaky heart valve symptoms.
It is recommended that those who believe they are experiencing any of the leaking heart valve symptoms identified above visit their doctor or cardiologist. Some heart valve diseases can be easily identified by listening to your heart valve sounds with a stethoscope. This is usually the first step in diagnosing a heart valve disease or leak in the valve.
What can prevent heart disease?
Nothing can prevent heart disease but Cardiovascular exercise such as running, cycling and swimming, can help to reverse it or decrease your chances of being diagnosed with it.
Exercise helps to reduce your risk because it helps to lower cholesterol levels and increase the strength and efficiency of the heart.
What is one result of decreasing blood flow to the heart or brain?
The correct answer is faintness, dizziness.
What is heart-lung transplantation?
Yes, there is such a thing as a heart transplant.
Given the right medical criteria, heart transplants can be done for some patients. Other patients do not meet the criteria, or choose to not have a transplant. Other patients who might want a transplant are too poor / lack insurance.
Does the heart go behind the lungs?
No, the heart is placed on top of the left lung. That is why there are only two lobes on the left lung and three on the right. ONe lobe had to be removed in order for the heart to be placed. Although many people think the heart is in the centre of your lungs it is actually just in front of the left lung.
Why is the left ventricle the largest and strongest chamber in the heart?
The left ventricle is the strongest & largest chamber in the heart because it has to pump up against gravity, and also because it has to pump blood to the entire body so it has to be strong.
What separates the left ventricle from the left atrium?
The interatrial septum separates the left and right atria.
Why do I keep getting heart palpitations?
I'm no expert but if your palpitations are accompanied by shortness of breath, you could be suffering from anxiety attacks
