Chemical buffer systems are the most powerful mechanism for regulating changes i
ID: 3473297 • Letter: C
Question
Chemical buffer systems
are the most powerful mechanism for regulating changes in [H+] within the body
promote H+ excretion by the kidneys when acidosis occurs
stimulate the respiratory center when acidosis occurs
respond in one to three minutes to changes in hydrogen ion concentration
buffer changes in acid or base levels
The major importance of regulating ECF osmolarity is
to prevent spontaneous depolarization of nerve and muscle cell membranes because of shifts in Na+ balance
to prevent the urine from becoming too concentrated
to prevent an acid-base imbalance if the hydrogen ions were to become too concentrated or too dilute in the body fluids
to prevent fluid shifts between cells and the ECF, which could produce profound symptoms as the cells swell or shrink
to help maintain blood pressure
Digestion refers to the
mechanical breakdown of food.
chemical breakdown of food.
progressive dehydration of indigestible residue.
A and B only
A, B, and C
a.are the most powerful mechanism for regulating changes in [H+] within the body
b.promote H+ excretion by the kidneys when acidosis occurs
c.stimulate the respiratory center when acidosis occurs
d.respond in one to three minutes to changes in hydrogen ion concentration
e.buffer changes in acid or base levels
Explanation / Answer
For the first question, "Chemical buffer systems", technically all options are correct. However, if we try to zero in on the most relevant point with regard to chemical buffer system it would be that they buffer changes in acid or base levels.
The major importance of regulating ECF osmolarity is to prevent fluid shifts between cells and the ECF, which could produce profound symptoms as the cells swell or shrink
Digestion refers to both mechanical and chemical breakdown of food. (Option And B only) where Mechanical digestion is the first level of digestion where the food is broken down into smaller pieces and in chemical digestion enzymes break them down further.
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