Biophysics of Motor Systems

Skeletal muscle is responsible for generating the force necessary for movement and maintaining posture.

The sarcomere is the basic unit of skeletal muscle and is responsible for muscle contraction.

Myosin is the motor protein responsible for the sliding filament mechanism of muscle contraction.

Calcium ions play a crucial role in muscle contraction by initiating the sliding filament mechanism, binding to troponin and causing a conformational change, and releasing myosin from actin.

Motor unit recruitment, rate coding, and muscle fiber type all contribute to regulating the force of muscle contraction.

The cerebellum is primarily responsible for coordinating movement.

Alpha, beta, and gamma motor neurons are all types of motor neurons.

The Golgi tendon organ senses muscle tension, initiates the stretch reflex, and prevents muscle damage.

Isotonic, isometric, and eccentric contractions are all types of muscle contractions.

The motor cortex is primarily responsible for planning movement.

Type I, Type IIa, and Type IIb muscle fibers are all types of muscle fibers.

The basal ganglia are primarily responsible for selecting movement.

Fast-twitch, slow-twitch, and intermediate motor units are all types of motor units.

The vestibular system is responsible for maintaining balance, detecting head movement, and coordinating eye movement.

Central fatigue, peripheral fatigue, and metabolic fatigue are all types of muscle fatigue.