Because that is what is needed for maintaining homeostasis in the body. Our blood is slightly alkaline in order to do its job properly. If the blood were more acidic, with a lower pH level, we would be prone to more diseases.
All fluids in your body are around pH 7.4 (physiological pH). It is the best pH for your cells to survive in. If the pH of your body fluids begin to deviate from 7.4 then problems can arise.
Blood pH is normally 7.35-7.45. With excess CO2 in the circulatory system, cabonic acid becomes present, which in turn decreases pH of blood. Thus, to return blood pH to a normal level, ventilation is increased to increase oxygen saturation and decrease CO2 saturation, which will then reduce the amount of carbonic acid, which will normalize blood pH.
A normal blood oxygen level should be 90 or above (90-99). Any level below 89 qualifies you for oxygen. 74 is low and it means your brain and body are not getting enough oxygen. You should be evaluated by a pulmonologist and you should be on oxygen.
Kidneys have the most significant role in regulating the blood PH level by controlling the excretion and reabsorbtion of the main acids and bases.
breathing is controlled by the level of co2 in the blood, (not due to the fact that there may be low amounts of o2), there are chemoreceptors that measure the pH level of the blood, remember that co2 can be transported in the blood as carbonic acid, thus this acid lowers the pH. if a low pH is detected, it sends nerve impulses to our brain, that stimulates us to breathe in an effort to get rid of the co2.
The average pH level in blood is 7.35 to 7.45.
The pH level of the blood drops when exercising.
Blood pH should be 7.4.
The normal pH of blood is 7,35-7,45.
What causes a high PH level in the blood
7.4
7.35
In your blood it should be near 7.4.
7
Your body automatically balances the pH of your blood. If it did not, you would not be alive to have written your question.
Their blood pH level(Acidity) is obviously lower than ours. (The lower the pH level the more acidic a substance is-The higher the pH the less acidic a substance is) So considering battery acid has a pH of .5 and can burn through certain metals and the aliens blood seem to burn through many things I'd estimate the aliens have a blood pH level of about -5 through -10.