Where in a sarcomere do you find titin and tropomyosin

The titin in the sarcomere extends from the Z-line. The tropomyosin along with troponin binds inside the grooves between actin filament.  

Explanation:

The sarcomere is the unit of muscle tissue. The titin protein is very large and extends from the sarcomere. The titin binds to the thick filaments and it provides the elasticity.

The tropomyosin protein binds to the another protein, troponin. This complex help in contraction of muscles. The calcium binds to the troponin complex and thereby activating it and allow contraction of muscles.

showing a photograph would make this a hell of alot easier

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