a. summation of stimuli
Sumation of contraction
it is known as the threshold stimulus usually seen in tonic contraction
threshold stimulus
Generate a string of action potentials
Threshold Stimulation
threshold stimulus
Threshold stimulusThe minimal level of stimulation required to cause a fiber to contract is called the THRESHOLD STILULUS.
Threshold
The destruction of ACh receptors makes skeletal muscle less responsive to nerve stimulation and more likely to prematurely fatigue. With fewer ACh receptors available to bind to ACh, the skeletal muscle cell membrane potentials have a more difficult time reaching the threshold potential and initiating contraction. Thus, the normal degree of fatigue noted during repetitive nerve stimulation is exacerbated in an individual with myasthenia gravis.
true
Actually it is in the milliamp range. That is thousandths of an amp. 1 mA - Threshold of feeling, tingling sensation. 10-20 mA - "Can't let go!" current - onset of sustained muscular contraction. 100-300 mA - Ventricular fibrillation, fatal if continued
The threshold stimulus is the stimulus required to create an action potential. So any stimulus under this level will not cause muscle contraction, while a stimulus above this level will cause the muscle to contract. The higher the stimulus the more muscle fibers are recruited, and thus the higher the response.