Just finished my two online courses in anatomy & physiology. The professor said taking these two back-to-back, in one's first quarter, was not forbidden, but was not at all recommended due to the difficulty. But...I'm kind-of in a hurry to get my billing/coding/terminology  certificate, so I took them anyway. Final results are in: final grades of a "B" in both classes!! I'm glad to know my brain hasn't rotted from all the unemployment!