A skeletal muscle sarcomere after David Richfield's drawing on Wikimedia Commons, relaxed and contracted: the Z- and M-lines, the I and A bands, the H zone, the thin actin and thick myosin filaments with the myosin heads and tails, titin and CapZ. Every part lights up in both drawings at once, so…
A real anatomical diagram. Hover any part to see its name, click to answer the quiz question.