In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.

Question: Which of the following conditions causes a decrease in the O2 saturation of the hemoglobin that is not due to a decrease in the partial pressure of oxygen? 
 Options:  <1> Ventilation-perfusion ratio lower than normal. <2> Anemia. <3> Carbon monoxide poisoning. <4> Hypoventilation. <5> Shunt venoarterial.
3

Question: A 54-year-old patient with an alcoholic intake of 110 g / day, admitted due to chronic diarrhea and the appearance of muscle cramps in recent days. In the analytical one, glucose stands out 320 mg / dL, Urea 25 mg / dL, Creatinine 0.75 mg / dL, Potassium 2.5 mmol / L (3.5-5.1), Calcium 2.0 mmol / L (2 , 2-2.5), Phosphorus 0.52 mmol / L (0.87-1.55) Magnesium 0.25 mmol / L (0.66-0.99) and Albumin of 28 g / L (3552) With what would initiate the treatment? 
 Options:  <1> Insulin. <2> Potassium. <3> Calcium. <4> Match. <5> Magnesium.
5

Question: The Cori cycle: 
 Options:  <1> It involves the synthesis and degradation of glycogen. <2> It does not imply the conversion of lactate into pyruvate. <3> It only takes place in the liver. <4> Oxidizes tricarboxylic acids. <5> It involves glycolysis and gluconeogenesis.

5