Answer:
Perhaps general medical knowledge (in depth maybe)?
Explanation:
But really in a PowerPoint presentation you can write about anything so I suggest you think about which part of medicine you want to focus on (personal view but I hope it might help somehow).
Reduced blood volume leads to collapsing vessels, reduced pressure, and subsequently reduced perfusion pressure. The cardiovascular system combats low blood volume by constricting blood vessels until the body reaches a blood pressure that restores proper perfusion pressure.
