Biology The Essentials
Quiz 24: The Nervous System and the Senses
An Atom or Molecule with an Electrical Charge Is A(n) A
An atom or molecule with an electrical charge is a(n) A) isomer. B) isotope. C) ion. D) neurotransmitter. E) acid.
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If you were using electrodes and chemical tests to find a resting neuron,you would look for a neuron in which A) active transport is not occurring. B) sodium ions are more concentrated inside the cell than outside. C) very little metabolism is taking place. D) the inside of a neuron is positively charged as compared to the outside. E) potassium ions are more concentrated inside the cell than outside.
A nerve impulse travels about ________ times faster when it leaps between gaps in the myelin sheath than when it travels along an unmyelinated axon. A) 5 B) 10 C) 20 D) 100 E) 50
In myelinated axons A) potassium ions can diffuse into the axon only at sections that are myelinated. B) sodium ions can diffuse into the axon only at gaps in the myelin. C) sodium ions can diffuse out of the axon only at sections that are myelinated. D) All of the answer choices are correct.
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