why does not blood clot when it absorbs oxygen from the lungs?
967791
Hi. Blood platelets are the start of the clotting process. They stick together and thicken the blood at a wound (a good thing) or in artery (a bad thing). I don't think oxygen is the starter mechanism. The lungs provide oxygen for hemoglobin to absorb, so that oxygen is tied up.
357041
When we breathe in, we take in O2 which is distributed to all around our body via the red blood cells. Every cell needs O2 to survive, therefore without the respiratory system, cells would not receive O2 and therefore would die. O2 is also used in many other metabolic pathways in the human body, and so without it we would die.
305654
We have tiny little air sacs that make up our lung tissue. They're called "alveoli" (each one is an "alveolus"). In order to work properly, they need to maintain elasticity. It's also important that the walls of the sacs maintain their structural integrity. Cigarette smoke, air pollution, and some genetic conditions will cause the walls of the alveoli to harden or to lose their elasticity and for the individual sacs to collapse. If that happens, the surface area where oxygen can enter the bloodstream through the alveoli decreases. \n\nThis isn't a perfect analogy, but think about it this way: if you're trying to blow up a balloon, but you pinch the opening too tightly, you won't be able to get air into the balloon (your bloodstream). What you're doing there is decreasing the "surface area" of the hole. At a certain point, you won't be able to get any air in the balloon at all - or at least not enough to beat the resistance of the tension of the inner walls of the balloon. \n\nWith emphysema, as the disease progresses the person can't get enough oxygen through the walls of the alveoli and into the bloodstream to sustain life, and eventually asphyxiates. Even with increasingly pure doses of inhaled oxygen, the lungs lose their capacity to oxygenate the blood.\n\nAlthough emphysema isn't curable, lung transplantation offers some hope. Also, its progress can often be arrested by quitting smoking, reducing pollutants in one's environment, and by use of some steroids (some of which have very severe side-effects, though).
467845
how indepth do you want this?\n\nbasically caused by a pressure differential in your lungs (the diaphragm inflates the lungs)...the oxygen molecules are forced through alveoli (sacs) into the bloodstream because fo this pressure differential...at the same time...Carbon Dioxide flows in the opposite direction from the blood to teh lungs to be exhaled...the oxygen attaches itself to hemoglobin..which is found in the red blood cells...and is then transported throughout the body by the heart (arteries pump blood away from the heart to teh body..veins take the blood back)\n\nhope thats good enough lol
609717
An air embolus will travel to the heart and get stuck. Basically, the heart can't fill back up with blood because it can't get the air out of the chambers.\n\nIt takes about 50-100cc of air to cause a problem.
288481
the reason things stop bleeding is because the blood "clots." the blood cells and skin cells around the cut want to clot, by connecting to each other and weaving your skin back together (in a way).  when you apply pressure, you stop or slow the blood flow to the area, and you also stop the flow of blood through the cut, making it easier for the cells to do their clotting jobs.
220944
Arteries carry blood AWAY from the heart.  The name has nothing to do with the O2 content of the blood in the vessel, so pulmonary arteries are carring blood away from the heart to the lungs where it can get oxygenated.  Veins carry blood back to the heart.  In the case of pulmonary veins, they are carring oxygenated blood TO the heart so that the heart can pump it out to the rest of the body.  The answer is B. pulmonary veins.
223130
I know that blood contains hemoglobin, plasma, and platelets...platelets act as primary function in the clotting process.  hemoglobin contains oxygen to make new blood cells. plasma basically just takes up space.
966426
The reason why it is there is that it is more efficient to have a wall. It separates oxygenated from non-oxygenated blood so only oxygenated blood is sent to muscles.\n\nAmphibians and reptiles don't have a wall separating the oxygenated from non-oxygenated blood, they are alive, but their circulatory system is less efficient because some of the blood travelling to the muscles doesn't contain any oxygen.
237327
it happens , the partial perassure of o2 is less in cells than in hemaglobin so it diffusses in to cells frm hemoglbin
380360
well, let's think.\nwe have more oxygen than needed. the bronchiolar arterioles are the places where blood cells pick up oxygen. we don't need more oxygen, so we want less blood cells to pick it up. we want less blood cells - we constrict the arteriole, so less blood cells can get through, and...viola.
968702
A cleanly severed vessel is less likely to clot, therefore less likely to stop the blood flow. A crushed or mangled vessel has more places for the clot to form, so it could potentially stop the bleeding. Think of it like a garden hose - a nice clean cut gets a lot of water thrugh it. A mangled end still lets water out, but it impedes the flow. The slower the flow, the better chance of clotting (plus a slower flow means less blood loss).
10116
Blood absorbs oxygene, although you wouldn't call it a chemical.
24470
Blood is blue when it's not oxygenated, for instance when it's in veins, which return blood to the heart to be refilled with oxygen after it's been used.  Veins are those blue lines you can see under people's skin-- that's blood.  Blood in arteries (which are usually lower than veins and thus not visible through people's skin) is red. \n \nSo, to summarize, red oxygenated blood leaves the heart and goes around to the rest of your body, where it fuels your muscles and organs.  They use up the oxygen, turning it blue.  Via the veins-- those little blue lines that are visible sometimes in people's neck or hands-- the blood returns to be filled again with oxygen. \n \nWhen you cut yourself, the blood becomes oxygenated as soon as it hits the air, so that's why regardless of where it comes from it's always red by the time you see it. \n \n<3
572824
respiration..\n\nco2 is given off, it goes through our blood stream, reabsorbed by the alveoli, switched out with o2 by respiration
446344
blood being living cells would die and rot...you dont breath when youre dead, so they arent collecting any oxygen, yes like that other person, it will coagulate.  Also your heart isnt pumping so it will not be able to move through the vessels without this pressure, so it will clot...it isnt common for it to build up in the vessels, but the amount of time it was out will determine what happens...it is one of the factors that help crime investigators tell how long something has been dead..CSI/Law&Order-esque
619312
it goes into your lungs and then straight into your blood stream from there.  how do you think oxygen gets in your blood??