Physiology and Human Biology are the most important for medical school.
This is your argument.
Your entire analysis is based on just getting into UCLA. What is true for LA isn't necessarily true for everyone else
My entire analysis proves your argument is wrong. To prove a statement wrong, you only need one counterexample. While it is true that UCLA is unusual in recommending against A&P (anatomy and physiology), the point still stands. As such, your statement is wrong: physiology/human biology is NOT the most important. In fact, far from it.
For the same reason premeds shouldn't congregate in MCB because it is difficult, premeds shouldn't major in IB due to the following faulty assumptions:
1. Med schools care most about physiology/human biology. *This is obviously wrong. Most med schools recommend cell biology, biochemistry, and molecular biology. Not anatomy or physiology. And in the extreme case of UCLA, taking A&P is actually looked down upon.
2. Anatomy and physiology are helpful in medical school. *The general consensus is that A&P in undergrad will not help you much in undergraduate. In general, A&P classes are too broad and not informative enough to help at all.
If you're a premed, then I suggest you visit studentdoctor.net. Don't take advice from people who aren't premeds and haven't done enough research on the subject.