Eric C
Might suggest reading "Human Anatomy For Dummies". But you will probably disagree with that also. Sports medicine training manual might also help.
You didn't answer the question of why one would want your extensor muscles, the triceps, contracting, and giving resistance, when you are trying to curl, in the other direction, with your flexor muscles, the biceps, contracting? Fortunately, your arm muscles don't work the way that you believe, and described.
The world of physiology knowledge, has passed beyond your level of old broscience "knowledge."
To quote Dr. Leonard J.Ravitz, about the unacceptability of new scientific truths:
"Any basic discovery which sheds new light on the true nature of human beings is obviously of the highest medical, psychologic, and philosophic importance and in theory, such a discovery should be hailed with enthusiasm by all concerned. In practice, however, it is likely to encounter indifference or opposition from entrenched or prejudiced professionals. That is why, historically, it has taken about forty years for the new ideas to be accepted in the medical world.
This was realized by no less a scientist than Max Planck, who once observed:
'A new scientific truth does not triumph by convincing its opponents and making them see the light, but rather because its opponents eventually die, and a new generation grows up that is familiar with it.' "
Sadly, it seems Dr. Tesch's work has about another ten years to go, before the pros start paying attention. Though it is here right now, for those who have the intelligence to see its importance, to use right now.
No luck necessary, when you have real knowledge.
