How can I avoid that these two sentences end up with medical system? I do not want to use a synonym for medical system to avoid ambiguity. I further do not want to change the word order of sentence two in a great way because I think it hinders the "flow" of reading. Further, I do not want to use "their" in the second sentence because it may be not clear to what "their" refers to.
Any ideas? :-)
First, Section 2.1 describes how bugs can impair the correct functioning of a medical system. Then, Section 2.2 illustrates how bugs can affect the evolution of a medical system.