28. Afferent neurons transmit information A. from the central nervous system to

Question

28. Afferent neurons transmit information A. from the central nervous system to target organs and tissues in the periphery of the body B. from sensory receptors in the body to the central nervous system C. from one neuron to another neuron D. from the brain to regions of gray matter in the spinal cord 29. The opening of a voltage-gated Na'-channel has driven a cell's membrane potential from the resting potential to-5mV. The depolarization of the membrane potential by the Na-influx triggered the opening of another voltage-gated channel that caused a membrane potential overshoot. The membrane potential has. A. become more negative B. hyperpolarized C. become more positive D. returned to the resting level 30. The measurement of the change in membrane potential caused by a depolarization initiated at the arrow will show Site of initial depolarization change at electrode A when compared to electrode B A. a smaller change B. the same C. a larger change 31. After activation, a voltage-gated Na'-channel A. closes . locks open C. slowly depolarizes D. inactivates 32. A depolarizing stimulation to a motor neuron that is twice the threshold voltage A. triggers an action potential B. requires more K' during repolarization C. doubles the size of the action potential D. causes two action potentials 33. Just after the peak of an action potential, voltage-gated Na* Action potential channels are are that correctly flls in the blanks.) A. open B. inactivated open C. closed D. inactivated closed and voltage-gated K' channels (Choose the pair (in the correct order) open Time (ms)

Explanation / Answer

28 answer is A

Because afferent neurons transmit information to the central nervous system

29 Answer is C

Becomes more positive overshoot means continues to depolarized

When the membrane potential is more positive it' overshoot

30 Answer is smaller change

31 anwer is closes

Have two gates that function independently an activation gate that open stimulation , letting sodium ions into the cells, and an inactivation gate that closes to stop the entry of sodium ions

32 answer is C

33 closed and open

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