i want to know how lungs work and what is the role of them?
129190
Lung is a special organ which allows gas exchange. Air passes through trachea, bronchi, bronchioles and finally alveoli. Oxygen will diffuse form the alveoli into the blood plasma whereas the diffusion of carbon dioxide occurs in opposite direction.
440392
The heart is a powerful muscle slightly larger than your clenched fist. It works as a pump to send oxygen-rich blood through all parts of your body. Blood contains oxygen and nutrients that every cell in your body needs to survive. The oxygen-rich blood travels throughout the arteries and vessels, nourishing the body so that it can function properly.\n\nYour heart will beat an average of 100,000 times per day. In that time, it pumps more than 4,300 gallons of blood throughout your entire body.
131960
Air molecule???\nThe air we breath, Oxygen Nitrogen (not nitrate, just oxygen and nitrogen), goes in through your nose down to your lungs. Your red blood cells have tiny holes on them, and they "collect' the oxygen from your lungs, back to the heart, and gets pumped everywhere through your body. Your body takes the oxygen, have a bunch of reactions with them, and sends out the "waste" (carbon dioxide, etc), which goes back to your ticker, pumps it up to your lungs, and is breathed out. \n\nPlease, don't just use that as your research paper. It is much more detailed. :P
29151
This sounds like a school assignment.\n\nI will point you in the right direction.\n\nArteries are high pressue and thick walled vessles. They take blood under pressure away from the heart.\n\nVeins are thinner walled, and have valves and returen blood to the heart. They are also lower pressure.\n\nCapillaries are the smallest, are very thin walled for permeability and help get blood to the tissues and allow for nutrient and gas exchange.\n\nhttp://biology.about.com/library/organs/blcircsystem6.htm\n\nFor pictures and details.
267467
Trachea divides into bronchi, Bronchi divides into bronchioles and then inte alveoli. Alveoloi are called the air-sacs and they are involved in the air respiration process.\nSo the smallest branch of bronchi are the alveoli(plural)and alveolus(singular).
352484
Cardio== Heart. Pulmonary== Lung\nIn heart disease, when the heart cannot pump all the blood it receives, there is back pressure on the lungs. There is shortness of breath and fluid in the lungs. Similarly , in lung disease, the heart is affected and signs of heart failure may develop. tHe doctors will probably treat the primary condition and heart failure. They may keep your mother on diuretics, or water - pills.
316199
You have small, fine hairs in your nose and lungs as a filtration system to keep anything unhealthy from getting in. Unfortunately, the hairs, to do their job, are very moist and sticky, like fly paper. Eventually, there is a build up of waste, and you sneeze (nose) or cough (lungs) to clear it out. Then you grow new hairs and start again.\nThis is why smokers are constantly coughing. And why they get lung cancer when they've overloaded their lungs filtering system.
465209
All gases are taken into the lungs.
59796
Lungs fill with fluid as a consquence of many reasons.  One such biological reason can include decreased surfactant production by Type II pneumocytes in the lung.  This would result in an increase in the surface tension of fluid lining the alveolar endothelium.  The increase in surface tension of this fluid would pull the alveolus closed and could even eventually collapse it.
208301
First of all, when you think of lung collapse it isn't the entire organ that collapses. There are tiny air sacs in the lung called Alveloi. There are numbers of these alveloi in your lung. Everybody has some of these air sacs collapsed all the time. It is very small and doesn't effect everyday life.\n\nThere are many reasons that can cause the lung to collapse. Trauma, post surgery, pneumonia or other pulmonary infections, masses or tumors, air or fluid between the chest wall and the lung. \n\nThe reason that they can 'build back up' is that the alveloi are like balloons. If you can get air back into the air sacs with breathing exercises and other measures then they open back up.\n\nHope this helps
126802
All right, I'm first going to explain, briefly, the structure of the cardiovascular system, and then I'll move on to how the blood transports oxygen specifically.\n\nYour heart pumps blood from the right ventricle to your lungs, where it exchanges carbon dioxide for oxygen, and then continues to your left atria. The left atria pumps the blood to the left ventricle, which pumps blood through your arteries  to your capillaries, where the oxygen is released so that cells can use it. Carbon dioxide is picked up, and the blood continues to the veins, and back to the right atria.\n\nNow, your blood contains red blood cells, which contain two important molecules, hemoglobin and myoglobin. Both have a high affinity for oxygen, so, in your lungs, where there is a high oxygen concentration, oxygen binds to each of these two molecules (until the equilibrium point is reached). The red blood cells are pumped throughout the body. \n\nIn the body, the concentration of oxygen is lower than in the surrounding atmosphere, so the amount of hemoglobin (and myoglobin) which is binding oxygen decreases until it reaches the new equilibrium point. Active tissues use oxygen quickly, forming lots of CO2, which enters the blood, and is converted to carbonic acid by red blood cells, using the enzyme carbonic anhydrase. The change in pH lowers the affinity of hemoglobin for oxygen, so more oxygen is released from other red blood cells near working tissues. The carbonic acid is released back into the blood from red blood cells, where it dissociates into a proton (H+) and a bicarbonate ion. It travels through the blood back to the lungs, where it is converted back into CO2, and diffuses across the transport surfaces of the lungs due to the concentration gradient. Then the cycle starts over.
253415
The same as in any other member of life that has one. To make the lungs work.
165097
They are different in structure and also in the way that gas exchange occurs. \nIn gills, the water flows in a single direction, and the blood flow in the blood vessels occurs in the opposite direction. Thus optimal gas exchange is achieved (there are good illustrations in textbooks to understand this better). However, to take up oxygen effectively, gills need an enormous surface area, because oxygen is relatively scarce in water. Thus, the gill lamellae are subdivided into smaller lamellae, and these in turn into even smaller projections; these extremely thin laminas are supported in water, but collapse onto each other in air, because of  surface tension and gravity. \nLungs can be of 2 types: the basic model comprises paired sacs, with more or less elaborate inner walls for greater surface area, but also with a surfactant substance that decreases surface tension so that these sacs do not collapse. The air goes in and out of the lungs by way of a single duct, thus there isn't a continuous flow of oxygenated air. Less efficient, but air has so much oxygen that it works anyway. The exception are the lungs of birds, in which the blood vessels are at right angles with respect to air flow, and the latter is continuous and unidirectional. \nAll respiratory surfaces need to be moist, and lungs are no exception. However, in this case the moisture is _inside_ the body, and the body surface is still mostly impermeable. \n\nThird choice... that would be perhaps the tracheae of insects. Aquatic arthropods have lungs of different types, and terrestrial chelicerates do have special gills too. But insects have a different system: ducts that pierce the body wall and project inwards, taking oxygenated air directly to the tissues (no participation of the circulatory system).
482945
1.heart\nMain component of the circulatory system. It pumps blood to spread oxygen and nutrients to all over the body and to get some of the waste.\n2.Lungs\nTo take oxygen and put it in the blood.\n3Liver\nCleans toxins out of your body.\n4Kidneys\nThis one is my weakest answer - I know it helps filter your urine in some way.\n5.Stomach and intestines\nAbsorb nutrients from food.\n6.Mucles\nTo move.\n7.brain\nTo control the body.\n8.Bladder\nSo you don't piss yourself.
92003
The respiratory system is how you breath in and out. In fact, any organism that participates in gas exchange has a respiratory system. In humans and other mammals, the respiratory system consists of the airways, the lungs, and the respiratory muscles that mediate the movement of air into and out of the body.
449737
When you're breathing hard you're using your lungs, and your heart is pumping big time.  Be sure to not stop all of a sudden, but cool down eventually so your heart can slow down slowly.
655859
hemoglobin carries oxygen and crosses the placenta from mother to child.  they don't actually breathe until they are born, until that time their oxygen comes from their mothers.