Identify two places in the krebs cycle where a decrease in free energy is coupled with an increase in free energy

Kreb's cycle or the citric acid cycle is a part of cellular respiration involving a series of reactions to release stored energy by the oxidation of Acetly CoA.

The first step of the citric acid cycle shows a decrease in free energy which is coupled with an increase in free energy. It begins with the transfer of acetyl group from the acetyl CoA to form an oxaloacetate which further forms citrate. Acetyl CoA forming CoA shows a decrease in the free energy which is coupled with the conversion of the oxaloacetate into the citrate showing an increase in free energy.

Further, the conversion of citrate into α- ketoglutarate shows a decrease in the free energy which is coupled with the reduction of NAD+ to NADH showing an increase in free energy.

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.

hypoxemia refers to a below usual concentration of oxygen in the blood, mainly in the arteries. hypoxemia is an indication of an issue associated with circulation or breathing and may lead to various symptoms like shortness of breath.  

the condition is identified by determining the level of oxygen in the blood sample obtained from an artery. it can also be predicted by determining the oxygen saturation of the blood with the application of a pulse oximeter.  

the normal arterial oxygen is about 75 to 100 mm hg. the values underneath 60 mm hg is generally considered with the requirement for supplemental oxygen. the normal pulse oximeter readings generally range between 95 to 100 percent. the values under 90 percent are regarded as low.  

in the given case, the oxygen saturation is measured at 93 percent, hence, there is no need to administer oxygen, that is, one should withhold oxygen.