Which of the following distinguishes lymphatic vessels from veins? -lymphatics have valves, while veins do not. -lymphatics lack the three tunics present in veins. -lymphatics transport fluids toward the heart. -permeability of the walls

The correct answer is: Permeability of the walls

The walls of lymphatic vessels, capillaries are more permeable than those of blood capillaries and because of that able to absorb larger particles from the tissues, such as proteins, cells, bacteria.

Some of the differences between blood and lymphatic vessels also are:

•Blood vessels are not interrupted (closed circulatory system) while lymphatic vessels are interrupted via lymphatic nodes.

•Veins are connected with the central pump of the circulatory system-heart, while lymphatic vessels don’t have such structure.

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.