5. When plotted with pH on the Y axis and levels of acid or base on the X axis,

Question

5. When plotted with pH on the Y axis and levels of acid or base on the X axis, what would happen to the buffering curve if the concentration of buffer were decreased by 10X?

a. It would shift upwards
b. It would shift downwards
c. It would flatten out
d. It would become steeper
e. The pK of the buffer would be increased by 1 log unit

7. The value for pKa of bicarbonate
A. Is always very close to the value of the pH of the blood normally
B. Is close to the value of the pH of the blood when an individual is breathing rapidly C. Drops when levels of acidity increase in the blood
D. Is constant regardless of the levels of free H+
E. Becomes larger as more and more buffer is added to the solution

32. What is responsible for the depolarized plateau observed in autorhythmic (pacemaker) cells?

A. voltage-sensitive sodium channels
B. voltage-sensitive l-type calcium channels C. voltage-sensitive t-type calcium channels D. voltage-sensitive potassium channels
E. Acetylcholine-activated channels

Explanation / Answer

5) When plotted the curve on Xaxis the acid or base on Y axis the pH is plotted means if the concentration of the buffer is decreased means the pH value decreased when the H+ ion concentration increased means pH value decreases. E is the answer the pH of the buffer increased the 1 log time.

7) THE VALUE OF BICARBONATE: The pKa of the bicarbonate is 6.1 it is closure to 7.4 the blood pH outside the optimal buffering range of the carbonic acid bicarbonate buffer.(A is the answer ) because the pKa of the bicarbonate is also based on the carbondioxide that is present on the left side of the lungs, but these value is close to the blood pH normally.

32) When the membrane remains depolarized these phase is called as the plateau phase. The flow of Ca++ cations in the cells balances the flow of K+ cations out of the cells and keeps the membrane depolarized is observed in autorhythmic cells.

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