Partial pressure of arterial blood oxygen refers to ( ) A: Tension caused by oxygen molecules dissolved in arterial blood B: Oxygen partial pressure when oxygen saturation of hemoglobin is 50% C: Hemoglobin and oxygen binding capacity D: The actual number of milliliters containing 02 in 100ml of blood E: Tension created by chemically bound oxygen in the blood

2. When isotonic hypoxemia occurs A: Reduced blood oxygen content B: Decreased partial pressure of arterial blood oxygen C: Decreased oxygen saturation of hemoglobin D: Normal blood oxygen content E: Tissue cell utilization oxygen disorder

Propranolol is A: effective in the treatment of supraventricular arrhythmias B: effective in all angina pectoris cases by increasing the O2 supply C: lowers the blood pressure by reducing the renin synthesis D: cardioselective and having a partial agonist activity

Where is the highest partial pressure of carbon dioxide in the body A: Venous blood B: capillary blood C: arterial blood D: interstitial fluid E: intracellular fluid

Regarding the clinical manifestations of concussion, which of the<br/>following statements are correct?()<br/>A<br/>.Under normal circumstances, loss of consciousness does not exceed 30<br/>minutes <br/>B.<br/>No headache <br/>C<br/>.Elevated blood pressure <br/>D<br/>.Retrograde amnesia A: .Under normal circumstances, loss of consciousness does not exceed 30<br/>minutes <br/><br/>No headache B: .Elevated blood pressure C: .Retrograde amnesia D: No headache