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 mostly? 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

19) The correct option is C. depolarization of the plasma membrane, away from RMP.

Opening of sodium gate leads to depolarization of plasma membrane.

20) The correct option is A. occur on the dendrites of cell body.

Graded potentials are electrical signals that occur on the dendrites of cell body of a neuron. Dendrites are fine, branching extensions of a neuron, originating at the cell body, where graded potentials form in response to external inputs.

21) The correct option is B. Anaerobic glycolysis.

Anaerobic glycolysis is a key contributor to the total energy requirements for moderate to high intensity exercise lasting about one to two minutes.

22) The correct option is A. recruitment.

The synchronization and summation of motor units is referred to as the recruitment.

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