MUSCLE NERVE CARTILAGE BONE
SKELETAL MUSCLE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
the tetanic contraction is considered abnormal, while the twitch is a normal muscle response
|
|
|
the muscle twitch is prolonged and continuous while a tetanic contraction is brief and “jerky”
|
|
|
the muscle twitch is a brief and “jerky” movement, while the tetanic contraction is prolonged and continuous
|
|
|
the tetanic contraction is caused by a single stimulus, while the twitch is caused by very rapid multiple stimuli
|
Detailed explanation-1: -A skeletal muscle twitch differs from a tetanic contraction in that: A) the muscle twitch is prolonged and continuous while a tetanic contraction is brief and “jerky". B) the tetanic contraction is considered abnormal, while the twitch is a normal muscle response.
Detailed explanation-2: -The force of a tetanic contraction is greater than that of a twitch contraction because: a) More acetylcholine is released at the neuromuscular junction per nerve impulse.
Detailed explanation-3: -The main difference between skeletal and smooth muscle contraction is that skeletal muscle contraction occurs through the binding of calcium to troponin, whereas smooth muscle contraction occurs through the binding of calcium to calmodulin.
Detailed explanation-4: -The tetanic contractions of motor units are the effect of repetitive activations of muscle fibers and the summation of responses to successive stimuli.
Detailed explanation-5: -14 Distinguish between a twitch and a sustained contraction. A twitch is the contractile response of a single muscle fiber to a single stimulus from a motor neuron. A sustained contraction involves many motor neurons, and thus many units.