<prompt> All of the following decreases mean alveolar concentration MAC except:HypoxiaHypercapniaHypothyroidismHypovolemia  <response>: MAC can be affected by several physiological and pharmacological variables: Endocrine disorders does not affect MAC. MAC ed MAC ed Hypoxia Hypercapnia Hypovolemia Hypothermia Hypehermia 42 degree Hypercalcemia Hyponatraemia Hypernatraemia 