Exam 12: Muscle: Mechanisms of Contraction and Neural Control

Type IIX skeletal muscle fibers

Neurotransmitters are released at neuromuscular junctions to smooth muscle cells.

What structure is composed of protein filaments and is located in the center of the thick filaments?

When a muscle is stimulated to contract,calcium release channels in the SR will release Ca²⁺ by

The ______________ reflex prevents excessive muscle contraction.

Damage to the __________ nerve root would prevent the muscle spindle from transmitting information to the central nervous system.

The pyramidal tracts include the __________ and _____________ tracts.

The origin is the point of muscle attachment that is most stationary.

Damage to the lower motor neurons would induce

An increase in plasma creatine phosphokinase could indicate

_________ filaments are attached to dense bodies in smooth muscle cells.

Cardiac action potentials usually originate in ______________ cells.

The cerebellar influence on motor activity is excitatory.

Smooth,sustained muscle contractions in vivo are due to synchronous activation of motor units.

Sarcomeres contain elastic titin filaments which help the muscles return to their resting length during muscle relaxation.

Endurance training increases the oxidative capacity of a muscle cell.

What protein primarily makes up the thin filament?

Skeletal muscles at rest obtain most of their energy from the aerobic respiration of

What is the role of ATP in muscle contraction and relaxation?

Summation occurs in muscle cells when stimulus frequency increases to produce a greater force contraction.