Which of the following must be true about the structures of axons and muscle cells in order for nerve impulses to stimulate muscle contraction? . a- axons and muscle cells must both have structures that make and secrete the same small molecules.. b- axons and muscle cells must both have receptors that recognize the same small molecules.. c- axons must have structures that make and secrete molecules, and muscle cells must have receptors that recognize these molecules.. d-muscle cells must have structures that make and secrete molecules, and axons must have receptors that recognize these molecule

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.