Animal Physiology was undoubtedly the hardest course I had in college. There were people taking it for the second and third time because it was a prerequisite to Pharmacology for the Pharmacy students. Most of the questions required that you reproduce a diagram in color from the class lectures.
I got one of only 3 A’s he gave that entire year. Freshman Med School physiology was easy by comparison. The other two A’s were also in my class at Med School and we all smiled at the other guys struggling and silently thanked Dr. Ottis.