what is the main function of  heart?
454395
To circulate the blood.\n\nOf course, blood circulation is so important because it carries oxygen and nutrients to tissues, and carries wastr products, especially Carbon Dioxide, away from the tissues.
211555
Arteries\n\nThere are two major kinds of blood vessels, veins and arteries. arteries run from the heart to all the other body parts, and the heart pumps fresh blood into the arteries. All the cells in the body draw nourishment and oxygen from this blood and leave out waste and carbon dioxide. The veins then carry this impure blood back to the heart. The blood that goes to the lungs brings back extra oxygen and the liver and the small intestine play a major role in introducing nourishment into the blood stream
606273
I know much about the heart. It's one of the most important organs in your body. (probably the most important if you want to stay alive). It is a very complicated system.\n\nYour question is too broad, I don't understand what you're trying to ask. Your question is more of an opinion one. If you have a particular question, I'd would be glad to answer.
592754
it has so many functions.. all concerning autonomic actions (involuntary actions) - \nthe most important are: \n1- control of cardiac activity (it has 2 centers: cardiac accelerating and inhibitory centers)\n2- control of respiration (via dorsal and ventral motor neurones)\n3- regulation of heart rate and respiratory rate via central chemoreceptors\n4- regulation of arterial blood pressure by controlling the diameter of arterioles via vaso-motor center\n5- control of vital actions as swallowing ...etc
1123201
Cells are the basic building blocks of life. Their main goal is to maintain homeostasis, the way this is done is by using organic and inorganic molecules. Organic molecules are compounds containing carbons, whereas inorganic molecules are compounds that don't have carbon.  \n\nOne of the cells' main function is to make energy. The way it makes energy is via the Kreb Cycle, where it uses  organic molecules such as glucose, and breaks it down into energy ATP  another organic molecule. \n\nAnother function is Reproduction/Replication...cells use RNA (organic molecule) to make DNA (organic molecule).\n\nIf you look at cells on a larger scale, such as tissues...  note that there are four types of tissues: nervous tissues, connective tissue, muscle tissue, and  epidermal tissue.... if you look at the nervous tissue in order for a signal to be transmitted from the brain to the muscle,  neurons have to be able to send the message from the brain to the muscle using action potentials, which use inorganic molecules such as sodium and potassium, in the ion channels in a voltage sensitive gate.  Due to diffusion and osmosis, the ion gates open and close based on concentration levels of sodium and potassium and also based on the action potential. \n\nNote: that you question is very broad and requires not only the knowledge of basic biology but systemic physiology as well. If you want more answers or something you may email me.
467229
In the human body, the heart is normally situated slightly to the left of the middle of the thorax, underneath the sternum (breastbone). It is enclosed by a sac known as the pericardium and is surrounded by the lungs. The apex is the blunt point at the base of the heart. A stethoscope can be placed directly over the apex and count the beats. In normal adults, its mass is 250-350 g, but extremely diseased hearts can be up to 1000 g in mass. It consists of four chambers, the two upper atria (singular: atrium) and the two lower ventricles.\n\nA septum divides the right atrium and ventricle from the left atrium and ventricle, preventing blood from passing between them. Valves between the atria and ventricles (atrioventricular valves) maintain coordinated unidirectional flow of blood from the atria to the ventricles.The ventricular systole consists of the contraction of the ventricles and flow of blood into the circulatory system. Again, once all the blood empties from the ventricles, the pulmonary and aortic semilunar valves close. Finally complete cardiac diastole involves relaxation of the atria and ventricles in preparation for refilling with circulating blood.\n\nThe function of the right side of the heart (see right heart) is to collect deoxygenated blood from the body and pump it into the lungs so that carbon dioxide can be dropped off and oxygen picked up. This happens through a process called diffusion. The left side (see left heart) collects oxygenated blood from the lungs and pumps it out to the body. On both sides, the lower ventricles are thicker than the upper atria.\n\nOxygen-depleted or deoxygenated blood from the body enters the right atrium through two great veins, the superior vena cava which drains the upper part of the body and the inferior vena cava that drains the lower part. The blood then passes through the tricuspid valve to the right ventricle. The right ventricle pumps the deoxygenated blood to the lungs, through the pulmonary artery. In the lungs gaseous exchange takes places and the blood releases carbon dioxide into the lung cavity and picks up oxygen. The oxygenated blood then flows through pulmonary veins to the left atrium. From the left atrium this newly oxygenated blood passes through the mitral valve (also called the bicuspid valve) to enter the left ventricle. The left ventricle then pumps the blood through the aorta to the entire body. Even the lungs take some of the blood supply from the aorta via bronchial arteries.\n\nThe left ventricle is much more muscular (1.3 - 1.5 cm thick) than the right (0.3 - 0.5 cm thick) as it has to pump blood around the entire body, which involves exerting a considerable force to overcome the vascular pressure. As the right ventricle needs to pump blood only to the lungs, it requires less muscle.\n\nEven though the ventricles lie below the atria, the two vessels through which the blood exits the heart (the pulmonary artery and the aorta) leave the heart at its top side.\n\nThe contractile nature of the heart is due to the presence of cardiac muscle in its wall which can work continuously without fatigue. The heart wall is made of three distinct layers. The first is the outer epicardium which is composed of a layer of flattened epithelial cells and connective tissue. Beneath this is a much thicker myocardium made up of cardiac muscle. The endocardium is a further layer of flattened epithelial cells and connective tissue which lines the chambers of the heart.\n\nThe blood supply to the heart itself is supplied by the left and right coronary arteries, which branch off from the aorta.
681799
The heart simply pumps the blood to supply the brain with "power." The heart cannot live without the brain, and the brain cannot live without the heart. Along these lines of thinking, that the two work in perfect tandem, I believe that is why we say that some emotions come from the heart. \n\nUsually, we associate sentimental or sensual emotions with the heart and knowledge or intelligence/common sense with the brain, when really, they all originate in the brain. But I think it's a great metaphor to indicate emphasis on your feelings when you are trying to communicate how you feel. This heart vs. brain thing seems to be a phenonmenon across cultures and languages. \n\nJust a side note: the ancient egyptians thought that the heart was the main thinking and reasoning organ of the body so this was one of the only organs that they would leave IN the body during mummification. They would extract other organs that they felt weren't necessary for the afterlife (liver, kidneys....and the brain). They thought that the heart was the essential organ so that they could function in the afterlife.
511421
I am surprised that this information is not in your textbook nor presented in your class.  Perhaps you should reread your materials.\n\nAnyway, ventricles are used to pump blood away from the heart.  Atriums received blood from the body and pass it to the ventricles.  Since these areas of the heart are right next to each other, the atriums do not have to work as hard.  This means that they require less muscle mass.  Ventricles move blood to the lungs and to the body.  The blood has a farther distance to travel and the ventricles need to apply more force.  This results in the ventricles having more muscle mass and, therefore, have thicker walls.
260629
The heart muscle, like every other organ or tissue in your body, needs oxygen-rich blood to survive. Blood is supplied to the heart by its own vascular system, called coronary circulation. \n\nThe aorta (the main blood supplier to the body) branches off into two main coronary blood vessels (also called arteries). These coronary arteries branch off into smaller arteries, which supply oxygen-rich blood to the entire heart muscle.\n\nThe right coronary artery supplies blood mainly to the right side of the heart. The right side of the heart is smaller because it pumps blood only to the lungs.\n\nThe left coronary artery, which branches into the left anterior descending artery and the circumflex artery, supplies blood to the left side of the heart. The left side of the heart is larger and more muscular because it pumps blood to the rest of the body.
825565
The ancients considered the heart the center of both emotion and intelligence. The connection between the heart and emotions is derived from that early false belief. Incidentally, that belief left them with the problem of what the purpose of the brain might be. A common theory was that the brain was a cooling mechanism for the blood.
1155102
As we come to the vertebrates, we begin to find real efficiencies with the closed system. Fish possess one of the simplest types of true heart. A fish's heart is a two-chambered organ composed of one atrium and one ventricle. The heart has muscular walls and a valve between its chambers. Blood is pumped from the heart to the gills, where it receives oxygen and gets rid of carbon dioxide. Blood then moves on to the organs of the body, where nutrients, gases, and wastes are exchanged. However, there is no division of the circulation between the respiratory organs and the rest of the body. That is, the blood travels in a circuit which takes blood from heart to gills to organs and back to the heart to start its circuitous journey again.\n\nFrogs have a three-chambered heart, consisting of two atria and a single ventricle. Blood leaving the ventricle passes into a forked aorta, where the blood has an equal opportunity to travel through a circuit of vessels leading to the lungs or a circuit leading to the other organs. Blood returning to the heart from the lungs passes into one atrium, while blood returning from the rest of the body passes into the other. Both atria empty into the single ventricle. While this makes sure that some blood always passes to the lungs and then back to the heart, the mixing of oxygenated and deoxygenated blood in the single ventricle means the organs are not getting blood saturated with oxygen. Still, for a cold-blooded creature like the frog, the system works well. Humans and all other mammals, as well as birds, have a four-chambered heart with two atria and two ventricles. Deoxygenated and oxygenated blood are not mixed. The four chambers ensure efficient and rapid movement of highly oxygenated blood to the organs of the body. This has helped in thermal regulation and in rapid, sustained muscle movements.
646881
cardiovascular system
878424
dear friend\n\nplease note that the heart is dual pump in other words there are right pump and left pump.\n\nthese right and left pump work together in a harmonious way\neach pump is made up of atrium and ventricle\n\nplease note that atria DO NOT pump blood to lungs instead they pump blood ONLY TO VENTRICLES. it is applicable for both the right and the left pump.\n\nthe ventricles on the other hand differ in their pumping destination\n\nright ventricle will pump blood only to LUNGS\n\nleft ventricle will pump blood only to THROUGHT OUT THE BODY\n\nwith regards \nkurian
1123531
With the average heart rate of 72 beats per minute the heart will pump about 5 litres per ventricle, or about 10 litres total per minute. This is called the cardiac output. In a trained athlete the total cardiac output is about 20 litres. If we multiply the normal, non-athlete output by the average age of 70 years, we see that the cardiac output of the average human heart over a life time would be about 1 million litres, or about 250,000 gallons(US)!
193026
The monitoring, recording, and measuring of a living organism's basic physiological functions, such as heart rate, muscle activity, and body temperature, by the use of telemetry techniques.
1034043
there are many kinds of elements and compounds in human body such as blood circulation, repiratory system,muscular system and productive system etc. for an example the function of the blood circulation is to circulate the blood to the whole body . the blood have a pigmen called hemoglobyn to bring along oxygen to the cell in our body. every cell need an oxygen to live. \n\nfurthemore ,our body is contain by many things such as leucosyte , good bacteria , ions , platlet , enzym , hormon , water , uric acid , vitamins, etc. each of this element have their function.
128249
- Are you talking about the the love or romance...?\n- the work of HEARTS is nothing but controlling your blood circulation.\n- But your thinking and attitudes are controlled by the signals generated in the Brain.\n- lol\n---------------