ABCP Board review exam 2023 with 100% correct answers

The major cation found in extracellular fluid is? a) K+ b) Ca++ c) Mg++ d) Na+ - correct answer d) Na+ Oxygen delivery will be decreased when a low venous oxygen tension and high venous oxyhemoglobin saturation are present due to: a) increase in P50 b) decrease in P50 c) metabolic alkalosis d) metabolic acidosis - correct answer c) metabolic alkalosis At a given PO2, increasing PCO2 results in: a) more O2 bound to the hemoglobin b) less O2 bound to hemoglobin c) no effect on amt of O2 bound to hemoglobin d) decrease in P50 - correct answer b) less O2 bound to the hemoglobin A sample of blood cooled from 37'C will undergo which change? a) CO2 becomes more soluble and PaCO2 decreases b) CO2 becomes less soluble and pH decreases c) CO solubility does not change, bicarbonate increases d) CO2 solubility increases and base excess decreases - correct answer a) CO2 becomes more soluble and PaCO2 decreases In 85-95% of patients, the circumflex artery supplies the: a) lateral aspect of left ventricle b) entire posterior surface of left ventricle c) posterior ventricular septum d) anterior medial papillary muscle - correct answer a) the lateral aspect of left ventricle A