The diagram below tells you with mitochondria oxygenation pathway in the correlation with tissue hypoxia.

This pathway diagram emphasizes the interconnectedness of the components of tissue oxygenation in the pathway for oxygen from outside air to ultimate consumption within the mitochondria of cells.
Read more »
The following schematic appears Hypotension and Shock Algoritm Guideline for Physicians. This guideline outlines therapeutic algorithm for such hypovolemic shock, septic shock, obstructive shock, right ventricular myocard infarct, and cardiogenic shock.

How to do a fluid challenge to maximize cardiac output related to hypotension and/or shock was also described in the following document.
Read more »