inclass review for exam 2

true/ false:

Hypoventilation increases the alveolar-arterial PO2 difference

false

true/false:

Doubling the alveolar ventilation doubles the arterial PO2

false

true/ false:

Interstitial fibrosis increases the alveolar-arterial PO2 difference.

true

true/false:

Hyperventilation increases the inspired PO2

false

true/ false:

Ascent to high altitude increases mean pulmonary arterial pressure.

true

true/ false:

Emphysema decreases the diffusivity of oxygen.

false

true/ false:

Hemoglobin in the mixed venous blood is normally about 50% saturated with oxygen.

false

true/ false:

Chronic hypoxia increases the production of 2,3-BPG by red blood cells.

true

true/ false:

Hyperventilation shifts the arterial blood oxyhemoglobin dissociation to the left.

true

true/ false:

Administration of 100% oxygen significantly increases the arterial oxygen content in a normal healthy person.

False

true/ false:

The oxyhemoglobin dissociation curve for mixed venous blood, compared to the arterial blood is shifted to the right.

true

true/ false:

A narcotic overdose may be lethal due to suppression of the medullary respiratory center response to carbon dioxide.

true

true/ false:

The presence of alveolar dead space decreases the mixed expired PCO2

true

true/ false:

The shunt equation conceptually divides all alveolar-capillary units into two groups: shunt and alveolar dead space.

false

true/ false:

V/Q ratios in gravity-independent regions of the lung are greater than in gravity-dependent regions of the lung.

true

true/ false:

An increase in blood temperature increases the affinity of oxygen for heme groups.

false

true/ false:

Carbon monoxide shifts the oxyhemoglobin dissociation curve to the left at lower PO2's

true

true/ false:

Anemia decreases the % saturation of arterial blood.

false

true/ false:

A decrease in arterial PO2 stimulates BOTH arterial and central chemoreceptors.

false

true/ false:

The medullary respiratory is normally more sensitive to hypercapnia than to hypoxia

true

true/ false:

Somatic pain causes hypoventilation

false

true/ false:

The most powerful influence on the rate and depth of breathing is the chemoreceptor-mediated response to CO2

false

true/ false:

A weak acid is more effective buffer than a strong acid

true

true/ false:

Ascension of high altitude may lead to respiratory alkalosis

true

true/ false:

Metabolic acidosis is associated with an increased arterial bicarbonate concentration.

false

true/ false:

Anemia may cause metabolic acidosis

true

true/ false:

Compensation for respiratory alkalosis is metabolic acidosis

true

Interpret the arterial blood gas: pH= 7.49, PaCO2= 50 mmHg, HCO3- = 36 mEq/L

Partially compensated metabolic alkalosis

Interpret the arterial blood gas: pH= 7.31, PaCO2= 52 mmHg, HCO3- = 25 mEq/L

Uncompensated respiratory acidosis