Question 1

Which of the following events occurs during exercise at work rates above 60-80% VO2 max?

Accepted Answer

A)  a decrease in plasma bicarbonate concentration
B)  an increase in blood lactic acid concentration
C)  a decrease in blood pH
D)  All of the above answers are correct

Question 2

Which of the extracellular buffers contributes the most to the cell's buffering capacity?

Accepted Answer

A)  bicarbonate
B)  hemoglobin
C)  extracellular proteins
D)  all of the above contribute equally

Question 3

Which of the following events are not primary sources of hydrogen ions during rigorous exercise?

Accepted Answer

A)  ATP breakdown and release of hydrogen ions
B)  Increased production of lactic acid
C)  Aerobic metabolism of glucose resulting in the production of carbonic acid
D)  anaerobic production of 3-phosphoglucose during glycolysis

Question 4

Acidosis can occur due to

Accepted Answer

A)  a decrease in the H+ concentration.
B)  a loss of acids from the blood.
C)  an accumulation of bases in the blood.
D)  none of the above.

Question 5

The principal buffer against acidosis during exercise is intracellular phosphate groups.

Accepted Answer

A) True 
 B)False

Question 6

An increase in the hydrogen ion concentration in contracting skeletal muscle can impair performance by hydrogen ions competing with calcium ions for binding sites on troponin.

Accepted Answer

A) True 
 B)False

Question 7

According to the Henderson-Hasselbalch equation,the pH of a weak acid solution is determined by

Accepted Answer

A)  ratio of the concentration of the acid in solution to the concentration of the base
B)  ratio of the concentration of the base in solution to the concentration of the acid
C)  the dissociation constant of bicarbonate
D)  All of the above answers are correct

Question 8

Which of the following statements about a buffer is correct?

Accepted Answer

A)  a buffer resists pH change
B)  a buffer removes hydrogen ions from solution
C)  buffers often consist of a weak acid and its conjugate base
D)  All of the above answers are correct

Question 9

Repeated bouts of high intensity exercise (e.g. ,interval training) can reduce arterial pH to levels as low as

Accepted Answer

A)  7.3
B)  7.2
C)  7.1
D)  None of the above answers are correct

Question 10

One of the principal means by which the kidneys regulate acid-base balance is by increasing or decreasing the bicarbonate concentration of the blood.

Accepted Answer

A) True 
 B)False

Exam 12: Acid-Base Balance

One of the principal means by which the kidneys regulate acid-base balance is by increasing or decreasing the bicarbonate concentration of the blood.

Correct Answer
verified

The principal buffer against acidosis during exercise is intracellular phosphate groups.

Correct Answer
verified

Which of the following events occurs during exercise at work rates above 60-80% VO₂ max?

Correct Answer
verified

Which of the extracellular buffers contributes the most to the cell's buffering capacity?

Correct Answer
verified

An increase in the hydrogen ion concentration in contracting skeletal muscle can impair performance by hydrogen ions competing with calcium ions for binding sites on troponin.

Correct Answer
verified

Repeated bouts of high intensity exercise (e.g. ,interval training) can reduce arterial pH to levels as low as

Correct Answer
verified

Which of the following events are not primary sources of hydrogen ions during rigorous exercise?

Correct Answer
verified

Which of the following statements about a buffer is correct?

Correct Answer
verified

According to the Henderson-Hasselbalch equation,the pH of a weak acid solution is determined by

Correct Answer
verified

Acidosis can occur due to

Correct Answer
verified

Exam 12: Acid-Base Balance

One of the principal means by which the kidneys regulate acid-base balance is by increasing or decreasing the bicarbonate concentration of the blood.

Correct AnswerverifiedShow Answer

The principal buffer against acidosis during exercise is intracellular phosphate groups.

Correct AnswerverifiedShow Answer

Which of the following events occurs during exercise at work rates above 60-80% VO2 max?

Correct AnswerverifiedShow Answer

Which of the extracellular buffers contributes the most to the cell's buffering capacity?

Correct AnswerverifiedShow Answer

An increase in the hydrogen ion concentration in contracting skeletal muscle can impair performance by hydrogen ions competing with calcium ions for binding sites on troponin.

Correct AnswerverifiedShow Answer

Repeated bouts of high intensity exercise (e.g. ,interval training) can reduce arterial pH to levels as low as

Correct AnswerverifiedShow Answer

Which of the following events are not primary sources of hydrogen ions during rigorous exercise?

Correct AnswerverifiedShow Answer

Which of the following statements about a buffer is correct?

Correct AnswerverifiedShow Answer

According to the Henderson-Hasselbalch equation,the pH of a weak acid solution is determined by

Correct AnswerverifiedShow Answer

Acidosis can occur due to

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Which of the following events occurs during exercise at work rates above 60-80% VO₂ max?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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