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Is the pH of the blood different in artery and vein?having dissolved carbon-dioxide in...

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abhinavhavle | Student, Undergraduate | eNotes Newbie

Posted August 25, 2010 at 12:34 AM via web

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Is the pH of the blood different in artery and vein?

having dissolved carbon-dioxide in the veins is the pH lower in the veins?

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dano7744 | College Teacher | (Level 2) Educator

Posted August 25, 2010 at 6:53 PM (Answer #1)

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An acid can donate hydrogen ions, a base can accept hydrogen ions into solution. The acid-base balance in the body is maintained by several complicated mechanisms.

One way in which acid-base balance is maintained are by the use of buffer systems. Buffers help to change the pH of the blood. For example, the hemoglobin/oxyhemoglobin system is a very effective body buffer. In erythrocytes, free hydrogen ions bind with hemoglobin . For every free hydrogen ion that binds with hemoglobin, a corresponding bicarbonate ion diffuses out of the red blood cell into the plasma. Also, chloride ions are exchanged with bicarbonate ions.

When blood leaves the venous system, the bicarbonate and chloride ions exchange. This results in a higher chloride concentration in the venous blood, hence, the pH is changed. Venous blood will have a lower pH than arterial blood. Additionally, increased levels of CO2 in the venous system also play a role in regulating pH.

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harshita123 | Student, Undergraduate | (Level 1) eNoter

Posted August 27, 2010 at 1:25 AM (Answer #2)

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yes it is

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