MEDICAL PHYSIOLOGY

Detailed explanation-1: -Neural control regulates concentric, eccentric and isometric contractions, muscle fiber recruitment, and muscle tone. A crucial aspect of nervous system control of skeletal muscles is the role of motor units.

Detailed explanation-2: -Motor neurons use a rate code to signal the amount of force to be exerted by a muscle. An increase in the rate of action potentials fired by the motor neuron causes an increase in the amount of force that the motor unit generates.

Detailed explanation-3: -The thin filament proteins tropomyosin and troponin regulate the contraction of striated muscle. Tropomyosin is an elongated, coiled-coil molecule that binds to the surface of the thin actin filament.

Detailed explanation-4: -The force generated by a muscle depends on the number of actin and myosin cross-bridges formed; a larger number of cross-bridges results in a larger amount of force.

Detailed explanation-5: -The spinal cord. The spinal cord plays a fundamental role for the execution of movement. It contains the motor neurons responsible for muscle contraction.