19. Opening of sodium gates typically leads to A repolarization of the plasma me

Question

19. Opening of sodium gates typically leads to A repolarization of the plasma membrane, back to resting membrane potential (RMP) B. hyperpolarization of the plasma membrane, more negative than RMP C. depolarization of the plasma membrane, away from RMP D, drifting of plasma membrane voltage toward a more negative value. E. all of the above 20. Graded potentials A. occur on the dendrites of cell body B. occur due to opening and closing of ligand gated channels C. do not spread very far distances down the membrane D. can stimulate an action potential if the membrane changes to -55mV E. all of the above 21. For rapid energy utilization such as a maximal contraction lasting about 5 seconds, the muscle will use nnostly A. Aerobic metabolism B. Anaerobic glycolysis C. the ATP/CP system D. Muscle MilkO 22. The synchronization and summation of motor units to perform a contraction is referred to as? A. recruitment B. action potential C. rigor mortis D. excitation-contraction 23. What specific type of channel is located in the trigger zone (Axon hillock) of the neuron plasma membrane which is required to generate an action potential? A. neurotransmitter channel B. ligand-gated channel C. leaky channel D. sodium-potassium pump E. voltage-gated channel 24. During the absolute refractory period in a neuron, A. the signal grows weaker with distance. B. it is possible to trigger a new action potential, but only with an unusually strong stimulus. C. no stimulus of any strength will trigger a new action potential. D. membrane potential is typically -55mV E. all the above 25. In order for muscles to contract, the neuron must send a signal to the muscle. Once the action potential is generated, the signal then goes? A. back to the soma of the neuron to the neuromuscular junction B down the dendrites of the neuron to the neuromuscular junction C. down the axon of the neuron to the neuromuscular junction D, the same action potential generated at the trigger zone directly stimulates the muscle fiber E. all of the above are true

Explanation / Answer

Question 19

Answer C (Depolarization of plasma membrane, away from RMP).

The first step in action potential generation is depolarization. The depolarization is due to the opening of sodium channels causes the influx of sodium ions and the resting membrane potential becomes less negative.

Question 20

Answer is E (All the above)

Graded potential occurs in dendrites or cell body of neurons

Occurs due to opening and closing of the ligand-gated channels.

Question 21,

Answer is C

The ATP/CP system. It is an anaerobic metabolism. it can produce the energy of muscles about 15 seconds. The anaerobic glycolysis is also fast but not that much as Creatinine phosphate system(The ATP/CP system).

Question 22.

Answer A

Recruitment

here all the motor muscle gathered to perform the muscle contraction.

Question 23

Answer is E

Voltage-gated channels. More Specifically voltage-gated sodium channels. they are involved in depolarization of nerve cell.

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