pls explain the pulmonary circulation in the most easiest way to remember and to understand?
359505
Ill try-\nBlood comes into the right atrium, then to the right ventricle..it stays on the right side at first.  This blood doesnt have any oxygen in it, so the first thing you have to do is get it oxygenated-So, the blood goes from the right ventricle to the lungs.  Here, the blood picks up oxygen for the rest of the body, but it still has to be pumped to the rest of the body.  So the blood goes fro mthe lungs back to the heart, but this time it goes into the left atrium, then the left ventricle-from there is goes everwhere in the body, delivering oxygen.  Now, once the body has taken all the oxygen out, the blood goes back to the right atrium, for the whole cycle to start again.\nhere's the overall flow:\n\nBlood from the body without oxygen--->\nright Atrium--->Right Ventricle--->\nLungs, so it can get oxygen--->\nLeft Atrium--->Left Ventricle--->\nRest of the body, to deliver oxygen---->\nBack to the right atrium once the oxygen is used.
537443
Circulatory is just like a train or subway. It carries all the blood lightening fast through the body, then back to the station at the heart.
728324
Let's just call it Blood Pathway =)\n\nfrom ur system (outside the heart) unoxygenated blood --> right atrium --> tricuspid valve ---> right ventricle ---> pulmonary artery --> lungs (oxygenates blood) ---> pulmonary vein (blood is already oxygenated) ---> left atrium --> bicuspid valve --> left ventricle ---> system (outside heart) \n\nthe cycle goes back... \n\nAlways remember that the atria are the receiving chambers of the heart while the ventricles are the pumping chambers of the heart.\n\nThere are three varieties of blood vessels: arteries, veins, and capillaries. During blood circulation, the arteries carry blood away from the heart. The capillaries connect the arteries to veins. Finally, the veins carry the blood back to the heart.
1049982
The lungs are a rich lattice of alveoli, which provide an enormous surface area for gas exchange. A network of fine capillaries allows transport of blood over the surface of alveoli. Oxygen from the air inside the alveoli diffuses into the bloodstream, and carbon dioxide diffuses from the blood to the alveoli, both across the exceptionally thin alveolar membranes. The drawing and expulsion of air is driven by muscular action.
228065
Look down there..\nThe *.pdf is most detailed and informative.\n\nI am stunned at the total lack of sense displayed by some of these answers! Blood is red! Oxygen poor blood is more 'purpley' in colour but not blue. NONE OF THE BLOOD CIRCULATING INSIDE YOUR BODY IS BLUE!!!
782029
The right side of the heart is for pulmonary circulation. this is to take blood from the tissues rich in co2 and lower in Oxygen and circulate it thru the lungs. In the lungs the co2 is dumped off and a fresh load of oxygen is picked up by the hemoglobin in the red blood cell. The left side of the heart now gets this fresh blood and the left ventricle pumps blood thru the body but not the lungs. the right ventricle pumps blood thru the lungs.
536252
Lungs. Same as humans and most land mammals.
136796
heart rate\nblood pressure\namount of Carbon dioxide entering the lungs and the amount od oxygen.
745734
Give a demonstration of a lung.  Go to the grocery store and by a bunch of grapes on a stem.  Put the bunch in a plastic bag keeping the big main stem extended thru the bag.  You have made a lung once you seal the top of the bag.  grapes are the air sacs, branches the different sized bronchial tubes and the big one can be you trachea.  Good luck.
303652
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.
1109512
The Circulation of Blood\n\nThe human circulatory system is really a two-part system whose purpose is to bring oxygen-bearing blood to all the tissues of the body. When the heart contracts it pushes the blood out into two major loops or cycles. In the systemic loop, the blood circulates into the body’s systems, bringing oxygen to all its organs, structures and tissues and collecting carbon dioxide waste. In the pulmonary loop, the blood circulates to and from the lungs, to release the carbon dioxide and pick up new oxygen. The systemic cycle is controlled by the left side of the heart, the pulmonary cycle by the right side of the heart. Let’s look at what happens during each cycle:\n\nThe systemic loop begins when the oxygen-rich blood coming from the lungs enters the upper left chamber of the heart, the left atrium. As the chamber fills, it presses open the mitral valve and the blood flows down into the left ventricle. When the ventricles contract during a heartbeat, the blood on the left side is forced into the aorta. This largest artery of the body is an inch wide. The blood leaving the aorta brings oxygen to all the body’s cells through the network of ever smaller arteries and capillaries. The used blood from the body returns to the heart through the network of veins. All of the blood from the body is eventually collected into the two largest veins: the superior vena cava, which receives blood from the upper body, and the inferior vena cava, which receives blood from the lower body region. Both venae cavae empty the blood into the right atrium of the heart.\n\nFrom here the blood begins its journey through the pulmonary cycle. From the right atrium the blood descends into the right ventricle through the tricuspid valve. When the ventricle contracts, the blood is pushed into the pulmonary artery that branches into two main parts: one going to the left lung, one to the right lung. The fresh, oxygen-rich blood returns to the left atrium of the heart through the pulmonary veins.\n\nAlthough the circulatory system is made up of two cycles, both happen at the same time. The contraction of the heart muscle starts in the two atria, which push the blood into the ventricles. Then the walls of the ventricles squeeze together and force the blood out into the arteries: the aorta to the body and the pulmonary artery to the lungs. Afterwards, the heart muscle relaxes, allowing blood to flow in from the veins and fill the atria again. In healthy people the normal (resting) heart rate is about 72 beats per minute, but it can go much higher during strenuous exercise. Scientists have estimated that it takes about 30 seconds for a given portion of the blood to complete the entire cycle: from lungs to heart to body, back to the heart and out to the lungs.\n\n^_^
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.
1084888
A pulmonary valve is one in your heart.  It is a valve that opens and closes as your heart beats,.  When the heart beat pushs the blood out, valve closes, when heart beats the blood into the heart the valve opens.  I hope this helps.  The thump thump thump you hear when your heart beats is this exact motion, value opens and closes, thump thump thump!  Thats what a "heart beat" is!
235068
The first is surface area. The mammalian lung has a huge number pf alveoli compared to lung structures of reptiles and amphibians. The greater the surface area available for gas exchange, the more efficient will be the gas exhange.\n\nThe second requirement for gas exchange is assisted by the mamallian heart of four chambers as opposed to reptilian and many other hearts. There is an enormous amount of the circulatory system that passes directly to the pulmonary arteries and veins. Thus there is sufficient blood circulation in the lung area to remove oxygen and transfer it to the rest of the body.\n\nComparative biology will show far fewer alveoli in non-mammalian hearts (with the exception of birds). The other thing notable from compataive anatomy is that the mamallian heart (and that of birds) is a four chambered pump that does not mix unoxygenated blood with blood that has been oxygentated.\n\nSurface area and increased opportunities for deoxygenated hemoglobin to accept oxygen due to more efficient heart action.
835848
Wow, so there are a few answers to this:\n\n-The apnuestic center in the brain controls repirations.\n\n-The diaphragm is the muscle that helps move the lungs up and down. \n\n-The sudden drop in negative pressure in our chest cavity that signals our lungs to take a breath in once we have enhaled the last breath out.
541279
R. atrium to r. ventricle, into the pulmonary artery, which carries deoxygenated blood to the lungs. Once blood receives oxygen in the lungs, it returns to the heart via the pulmonary veins. Here it is emptied into the left atrium, then on to the left ventricle, which pumps the oxygenated blood into the aorta and thence out into the systemic circulation.
890787
Simple, bad blood goes from the heart to the lungs thru the pulmonary veins, and return to the heart already oxygenated thru the pulmonary arteries..☺