How does exocytosis differ from the pumping of calcium ions against a concentration gradient? a. exocytosis requires an expenditure of energy by the cell b. exocytosis is a form of passive transport c. exocytosis does not involve a transport protein d. exocytosis occurs with he concentration gradient

The correct answer is option B- exocytosis does not involve a transport protein

Exocytosis is a process of transporting material outside the cell enclosed in vesicles through an energy dependent process. Exocytosis is ana ctive transport method and does not include any transport protein.

whereas calcium ions pass through the membrane with the help of trans- membrane protein. These proteins make pores inside hydrophobic membrane and allow the ions to pass though it.

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.