A motor neuron along with all the muscle fibers innervated by it constitute a:

Myosin myofilaments are

1. made up of thick and thin myofilaments.

2. found only in the H zone.

3. not seen in the H zone.

4. attached to filaments that form the M line.

Identify the correct statement:

1. Tropomyosin is found in two forms – monomeric G and polymeric F.

2. The head of the myosin molecule binds to an active site on G actin.

3. ATPase is present in troponin A.

4. Actin molecules do not move during muscle contraction.