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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
When does the heart attack occur?
Statistically, most heart attacks, or myocardial infarctions, occur within 1-2 hours of waking from sleep. This is thought to be due to the sympathetic surge associated with awakening in the morning. This means most heart attacks occur between the hours of 4am and 10 am.
Which chamber of the heart sends oxygenated blood to systemic circulation when it contracts?
Deoxiginated blood returning to the heart from the systemic circuit first enters the right atrium. Oxigenated blood going away from the heart goes through the pulmonary veins, enters the left atrium, goes through the left ventrical, and exits through the aorta.
Just don't forget the three major parts of the circulatory system (( the lungs (pulmonary), the heart (coronary), and the rest of the system (systemic))) and keep in mind of their differences.
Keep on at it and study hard!
the average weight of a heart is between 6 and 8 pounds.
What is the alternating relaxation and contraction of the heart called?
Diastole is the relaxation phase. Systole is the contraction phase.
If you put these phases together you have the Cardiac Cycle...
Deoxygenated blood flows into the right atrium by way of the inferior and superior vena cava. The blood then funnels through the tricuspid valve and builds up in the right ventricle. With a strong contraction upward, the right ventricle pumps the blood upward through the pulmonic valve (pulmonary semilunar valve). The blood moves throught the pulmonary artery to the lungs where the exchange of carbon dioxide for oxygen takes place oxygen takes place. Oxygenated blood then flows from the lungs into the pulmonary veins. The pulmonary vein then dumps the oxygenated blood into the left atrium. Blood funnels through the mitral valve (bicuspid valve) into the left ventricle. a powerful contraction is made to push the blood through the aortic valve Oaortic semilunar valve) into the aorta where the blood is channeled throughout the body.
cardiovascular fitness
What does the heart continue to to do even if you are asleep?
your heart always beats to pump blood to the rest of your body
Vessels that carry oxygenated blood from heart to the organs?
The vessels that carry blood to the heart are called veins and the vessels that carry blood away from the heart are called arteries.
Arteries Always carry blood Away from the heart. Most are oxygenated except the pulmonary arteries which are low in oxygen and are going to the lungs to pick up oxygen.
Does the brain affect the heart?
im a biology major who has had an extensive range of biology classes
short answer: yes explanation: http://www.heartmath.org/research/research-our-heart-brain.html
What chambers in the heart contract simultaneously?
Sort of, but not really. The atria (top chambers, left and right) contract nearly simultaneously, expelling their load of blood into the left and right ventricles (respectively). The ventricles contract nearly simultaneously as well (the left slightly before the right usualy), but not enough to feel or see, unless the patient is hooked up to a ECG. Interestingly, the "lub dub" you hear from your heart is actually the sound of the various valves slamming shut before and after contractions.
An atrium is in the heart, it is the top two chamber of the heart. the right atrium deals with deoxygenated blood from the body, whereas the left atrium deals with oxygenated blood from the lungs.
What does the connective tissue do for the heart?
Connective tissue ensures that the different compartments of the heart do not interfere with each other. The connective tissue however keeps the compartments working closely together as one heart.
What are the advantages and disadvantages of heart transplants?
The advantages to the Kidney Transplant recipient are more obvious, with the most significant quality of life improvement being the possibility of freedom from dialysis. Dialysis is an expensive long term treatment modality that can be eliminated with a new Kidney, thus making the transplant a cost effective option for those reliant upon dialysis. Beyond the debilitating limitations of regular dialysis appointments there are other complications that compromise the lives of those who suffer Kidney failure, including living with an ugly AV fistula to provide ready access for dialysis and the risk of infection. The advantages or incentives for Kidney donors are more altruistic. However, many people do not realize when they sign a donor card or tick the box on their driving license that most of their organs can only be used under a very specific set of circumstances. The ideal potential cadaveric (non-living) donor organ is taken from a patient who has just had life support terminated after they were left in a persistent vegetative state (essentially rendered Brain Dead) following some type of accident. Due to the necessity for controlled preservation of the vital organs following death they only remain viable due to the life sustaining machine and once this is turned off organs are made available for harvesting. Despite your wishes, whether your organs will be viable for transplant will depend on the circumstances of your death. However, there are opportunities for a healthy, highly committed individual to make a proactive choice during their lifetime that offers guaranteed use of suitable body components, all, or in some cases just part, of one of their vital organs: Kidney Donation is just one example of this. Living-Related (or Unrelated) Donor Nephrectomy: Kidney Donation. You can live a perfectly normal life with just one Kidney. Although it is always a serious commitment to undertake elective Surgery, it can now be accomplished by accessing the Kidney via less intrusive Laparoscopic Surgery with a much smaller bikini line incision to remove the donated organ. This method involves a shorter hospital stay for the donor as it is far less traumatic for the body. The decision to donate a Kidney to a family member or unrelated friend is a huge commitment that should not be taken lightly, but it is one of the ways that you will be absolutely certain that your desire to donate is accomplished and you will benefit from witnessing the dramatic quality of life improvement in the lucky recipient. While there are no cast iron guarantees that it will work, as organs are sometimes rejected by the body, you will at least know that you tried best to help out.
If the parts of the heart were injured what will happen to the organism?
If the heart is injured or diseased, the organism is likely to die without medical intervention because the heart pumps blood to all parts of the body and without blood none of the organs will work.
If minor injury then it will heal, during which period the animal will have a reduced capacity for work.
If major, it will die.
What does it mean when you feel like your heart or breath stops for moment?
You should talk to your doctor about these symptoms.Could be just stress or anxiety or a more serious heart problem.
Is the heart in the upper left or upper right quadrant?
The heart in the human body is in the left upper quadrant of the thorax. It is very close to the center line, however.
What are short term effects of heart disease?
Heart attack basically occurs when blood flow to a section of heart muscle becomes blocked. If the flow of blood isn't restored quickly, the section of heart muscle becomes damaged from lack of oxygen and begins to die.
The most common heart attack signs and symptoms are:
- Chest discomfort or pain-uncomfortable pressure, squeezing, fullness, or pain in the center of the chest that can be mild or strong. This discomfort or pain lasts more than a few minutes or goes away and comes back.
- Upper body discomfort in one or both arms, the back, neck, jaw, or stomach.
- Shortness of breath may occur with or before chest discomfort.
- Other signs include nausea (feeling sick to your stomach), vomiting, lightheadedness or fainting, or breaking out in a cold sweat.
As per the study about half of all heart attack victims wait at least two hours before seeking help. This increases their chance of sudden death or being disabled. The longer the artery remains blocked during a heart attack, the more damage will be done to the heart. If the blood supply is cut off severely or for a long time, muscle cells suffer irreversible injury and die. This can cause the patient to die. That is why it is important to recognize the signs of a heart attack and seek prompt medical attention at the nearest hospital with 24-hour emergency cardiac care.
If you think you or someone you know may be having a heart attack:
- Call Ambulance within a few minutes-5 at the most-of the start of symptoms.
- If your symptoms stop completely in less than 5 minutes, still call your doctor.
- Only take an ambulance to the hospital. Going in a private car can delay treatment.
- Take a nitroglycerin pill if your doctor has prescribed this type of medicine
Acting fast at the first sign of heart attack symptoms can save your life and limit damage to your heart. Treatment is most effective when started within 1 hour of the beginning of symptoms.
In USA - call 911 or in the UK 999 (L)
