Worth 20 points will mark 
read the following statements that describe what happens as an impulse travels. what is the correct order in which the steps occur?
1) the impulse continues to travel down the axon away from the cell body.
2) na+ gates close and k+ ions flow back out of the cell restoring the resting potential.
3) gated k+ and na+ channels are closed. the inside of the cell is slightly negative compared to the outside.
4) the neuron receives a stimulus great enough to start an impulse.
5) gated na+ channels open. the net movement of na+ ions into the cell produces the action potential.
a. 4,5,3,1,2
b. 1,5,3,4,2
c. 3,1,5,4,2
d. 3,4,5,1,2

i think the miocene epoch spans the time from 23 million to 12 million years ago.

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.

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.