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NEETZoologyLocomotion and Movement

What is the role of troponin in the resting state actin filament?

Options

  1. ATo activate the binding sites for myosin on actin filaments
  2. BTo mask the active binding sites for myosin on actin filaments
  3. CTo separate the "F" actins
  4. DTo regulate the interaction between "F" actins and tropomyosin

Correct answer

B. To mask the active binding sites for myosin on actin filaments

Step-by-step solution

The striated appearance of myofibrils is due to the distribution pattern of two important proteins - Actin and Myosin. The light bands contain actin and the dark bands contain myosin.The light bands in a myofibril contain actin and is called I-band or Isotropic bandThe actin filaments are thinner as compared to the myosin filamentsThe portion of the myofibril between two successive "Z" lines is considered as the functional unit of contraction and is called a sarcomere. Each actin (thin) filament is made of two "F"

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