Question 1

Which of the following best describes the normal range for arterial blood pH in a healthy adult?

Accepted Answer

$$7.35 - 7.45$$

Question 2

A patient presents with a blood pH of $$7.30$$ and is experiencing shallow breathing due to emphysema. Which acid-base disorder is most likely present?

Accepted Answer

Respiratory acidosis

Question 3

Which equation represents the chemical reaction that links carbon dioxide and hydrogen ion concentration in the blood?

Accepted Answer

$$\mathrm{CO_2$ + H_2O \rightleftharpoons H_2CO_3 \rightleftharpoons H^+ + $$HCO_3$$^-}$$

Question 4

Which organ system is the ultimate regulator of acid-base balance in the body?

Accepted Answer

Renal (urinary) system

Question 5

A person is experiencing muscle tetany, nervousness, and convulsions. Their blood pH is measured at $$7.50. $$What is the most likely diagnosis?

Accepted Answer

Alkalosis

Question 6

Which of the following is a typical cause of metabolic acidosis?

Accepted Answer

Untreated diabetes mellitus

Question 7

How does the respiratory system compensate for metabolic acidosis?

Accepted Answer

By increasing respiratory rate and depth

Question 8

A patient with severe diarrhea is losing large amounts of bicarbonate ions. What acid-base disorder are they at risk for developing?

Accepted Answer

Metabolic acidosis

Question 9

Which of the following best explains why acidosis leads to hyperkalemia, as shown in the provided images?

Accepted Answer

H$$^+$$ ions move into cells, causing K$$^+$$ ions to move out of cells into the blood

Question 10

Which buffer system is the most important in regulating blood pH within seconds?

Accepted Answer

Bicarbonate buffer system

Question 11

A patient is hyperventilating due to anxiety. What acid-base imbalance are they most at risk for?

Accepted Answer

Respiratory alkalosis

Question 12

Which of the following is a typical cause of metabolic alkalosis?

Accepted Answer

Excessive vomiting from the stomach

Question 13

How do the kidneys compensate for respiratory acidosis?

Accepted Answer

By reabsorbing more HCO$$_3^-$$ and secreting more H$$^+$$

Question 14

Which of the following symptoms is most likely to occur in severe acidosis?

Accepted Answer

Confusion and coma

Question 15

A patient with metabolic alkalosis is likely to have which of the following changes in potassium levels, as shown in the images?

Accepted Answer

Hypokalemia

Question 16

Which of the following best describes the effect of excessive antacid ingestion on acid-base balance?

Accepted Answer

It causes metabolic alkalosis by increasing bicarbonate reabsorption

Question 17

Which of the following is the fastest acting mechanism for regulating blood pH?

Accepted Answer

Chemical buffer systems

Question 18

A patient with untreated diabetes mellitus is experiencing rapid, deep breathing (Kussmaul respirations). What is the physiological reason for this response?

Accepted Answer

To eliminate excess CO$$_2$$ and raise blood pH

Question 19

Which of the following best explains why alkalosis leads to hypokalemia, as shown in the images?

Accepted Answer

K$$^+$$ ions move into cells as H$$^+$$ ions move out

Question 20

Which of the following scenarios would most likely result in respiratory alkalosis?

Accepted Answer

A patient experiencing a panic attack and hyperventilating

Acid-Base Balance in Human Physiology

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