BackMuscle Physiology and Contraction Mechanisms
Terms in this set (12)
Muscle fibers that contract slowly, have high endurance, use aerobic respiration, and contain many mitochondria and myoglobin.
Muscle fibers that contract quickly, fatigue rapidly, rely on anaerobic glycolysis, and have fewer mitochondria and less myoglobin.
A molecule that stores energy in muscle cells to quickly regenerate ATP during the initial phase of muscle contraction.
An enzyme that breaks down acetylcholine in the synaptic cleft to terminate the muscle contraction signal.
Enter the muscle cell during depolarization, initiating the action potential that triggers contraction.
Bind to troponin, causing tropomyosin to move and expose binding sites on actin for myosin, enabling contraction.
A neurotransmitter released at the neuromuscular junction that triggers muscle cell depolarization and contraction.
A sustained muscle contraction resulting from rapid, repeated stimuli without relaxation between contractions.
The strongest stimulus that produces the greatest contractile response from a muscle.
The increase in muscle contraction strength due to successive stimuli arriving before the muscle relaxes completely.
The continuous, partial contraction of muscles that helps maintain posture and readiness for action.
The process of increasing muscle contraction strength by activating more motor units.