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Where does the waste carbon dioxide in blood go?

6 Answers
my question:where does the waste carbon dioxide in blood go?
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Waste co2 in the blood goes to the lungs to be exhaled. Co2 can usually be transported in far greater quantities than can oxygen. The co2 in the blood does have much to do with acid-base balance of the body fluids. Under normal resting conditions an average of 4ml of carbon dioxide is transported from the tissues to the lungs in each decilitre of blood.

To begin the process of co2 transport, co2 diffuses out of the tissue cells in the dissolved molecular co2 (but not to any significant extent in the bicarbonate form because the cell membrane is almost impermeable to bicarbonate ion). On entering the capillaries, the co2 initiates a host of almost instantaneous physical and chemical reactions that are essential for co2 transport.

A small portion of the carbon dioxide is transported in the dissolved state to the lungs. The pco2 of venous blood is 45mmhg.And that of arterial blood is 40mmhg. The amount of o2 dissolved in the fluid of the blood at 45mmhg is about 2,7mmhg/dl(2,7volumes per cent). The amount dissolved at 40mmhg is about 2,4ml or a difference of 0,3 mls. Therefore, only about 0,3ml of o2 is transported in the form of dissolved co2 by each dl of blood. This is about 7% of all the carbon dioxide transported.

The theoretical quantity of co2 that can be carried from the tissue to the lings in the carbamino combination with haemoglobin(hb) and plasma proteins is about 30% of total quantity transported-that is, normally about 1,5ml of co2 in each dl of blood. However, this reaction(rxn) is much slower than the rxn of co2 with water inside the red blood cells. It is doubtful that this mechanism provides transport of more than 20%of the total quantity.

An increase in co2 in the blood will causes oxygen to be displaced from the hb and that this increases oxygen transport. The reverse is true and this effect is called the haldane effect and is important in promoting co2 transport.

The combination of oxygen with the lungs causes the hb to become a more stronger acid. This in turn displaces co2 from the blood into the alveoli.
(1)the more highly acidic hb has less tendency to combine with co2 to form carbaminohb, thus displacing much of the co2 that is present in the carbamino form from the blood.
(2) the increased acidity of the hb also causes it to release an excess of hyrogen ions, and these in turn bind with bicaronate ions to form carbonic acid; then this dissociates into water and co2 ; and the c02 is released from the blood into the alveoli.

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It dissolves in the plasma, reacts with proteins to form carbamino compounds etc. However most is transported as bicarbonate ions. This carbon dioxide 'enriched' blood makes it's way to the tiny capillaries in the air sacs (alveoli) of the lungs where it leaves solution and diffuses out of the blood capillaries and enters the air inside the alveoli. This air is then got rid of during exhalation.

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W

TO know the pathway of CARBON DIOXIDE in BLOOD and other areas in human body,you have to understand the respiratory physiology of gases in blood,for your answer carbon dioxide is exhaled out of the body after the circle of respiration.

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It is returned to the heart as deoxyhemoglobin and is carried to the lungs by the pulmonary artery where it diffuses out of the aveoli in exchange for oxygen and then it is exhaled out of the body.

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J

When you inhale, oxygen from the air is passed to the blood. At the same time, carbon dioxide is passed from the blood into the lungs where it is expelled back into the atmosphere when you exhale.

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Go to lung and co2 & o2 exchange occurs..

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