Reduction in pH of blood will directly cause which of the following?
Correct answer: A. Decrease the affinity of haemoglobin with oxygen
- A. Decrease the affinity of haemoglobin with oxygen
- B. Release bicarbonate ions by the liver
- C. Reduce the rate of heart beat
- D. Reduce the blood supply to the brain.
Explanation
The correct option is "a". All options are explained below: a)"Decrease the affinity of hemoglobin with oxygen": This statement is correct. A reduction in blood pH (an increase in acidity) is typically associated with a condition called acidosis. In acidosis, the affinity of hemoglobin for oxygen decreases. This means that hemoglobin is less effective at binding with oxygen, which can lead to impaired oxygen transport to tissues. b)"Release bicarbonate ions by the liver": This option is not accurate. Bicarbonate ions are primarily released and regulated by the kidneys, not the liver. In cases of acidosis, the kidneys can help by increasing the production and release of bicarbonate ions into the bloodstream to help buffer the excess acid. c)"Reduce the rate of heart beat": This statement is not correct. In most cases, a reduction in blood pH (acidosis) can actually have the opposite effect and increase the heart rate as the body attempts to compensate for the acidosis by delivering more oxygen to tissues. d)"Reduce the blood supply to the brain": This option is not generally accurate. Acidosis can affect cerebral blood flow regulation, but it doesn't necessarily reduce blood supply to the brain. It can have complex effects, including the potential to increase cerebral blood flow in some cases. Summary: The correct answer is: "Decrease the affinity of hemoglobin with oxygen." A reduction in blood pH (acidosis) indeed decreases the affinity of hemoglobin for oxygen, impacting oxygen transport to tissues. The other options are not accurate in the context of blood pH changes.
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The human respiratory system includes the air passages, lungs, alveoli and breathing muscles, while gaseous exchange explains how oxygen enters blood and carbon dioxide leaves it by diffusion. The effects of smoking include damage to cilia and alveoli, reduced gas exchange, chronic bronchitis, emphysema and increased risk of lung cancer.
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