1. The membrane of end plate is also called: a. Pre-synaptic membrane b. SERCA c
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Question
1. The membrane of end plate is also called: a. Pre-synaptic membrane b. SERCA c. Post-synaptic membrane d. Sarcolemma. 2. e. Neurolemma membrane are Acetylcholine receptors located on the end plate a. Norepinephrine-regulated b. Calcium-regulated c. Troponin-regulated d. Acetylcholineesterase-regulated e. Voltage-regulated 3. At the endplate, Acetylcholine causes: a. Opening of Ca gates b. Simultaneous opening of both Nat and K gates c. Simultaneous opening of both Na and gates d. Simultaneous opening of both K and Cat gates e. Opening of Na gates only 4. End Plate Potentials: a. Do not have refractory periods b. Are conducted non-decrementally membrane c. Are initiated by the influx of Ca ions through the postsynaptic d. Have an initiation threshold e. c and d only fibers 5. Compared to Fast Twitch muscle fibers, Slow Twitch muscle a. Are recruited into action earlier during an exercise b. Fatigue faster, due to their smaller diameter c. Are recruited into action only during isometric action d. Are recruited into action only during isotonic action e. Drop out of the action with the recruitment of FT fibers uhonood imnl forrf nutnut of muscle fiber (flat portion of the length.Explanation / Answer
1.D Sarcolemma.
The sarcolemma has invaginations called postjunctional folds.These folds are called endplate.
2.D. Acetylcholineesterase regulated
3.B
Both Sodium and Potassium gates open when Ach receptors are activated.
4.During the action potential before the hyperpolarization phase, the membrane is unresponsive to any stimulation. This inability to induce another action potential is known as the absolute refractory period. So option A is not the answer.
Each acetylcholine vesicle contains approximately 5000 acetylcholine molecules. The vesicles release their entire quantity of acetylcholine and this causes miniature end plate potentials (MEPPs) to occur which are less than 1mV in amplitude and not enough to reach threshold. So option D is the answer.
5.Option D.Are recruited into action only during isotonic action.
They help in posture (tonicity) maintenance as they do not undergo fatigue easily.
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