NEURONS

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Question # 1 The basic unit of the nervous system is

    A) the neuron.
    B) neuroglia.
    C) the brain.
    D) a nerve.
    E) a nerve impulse.

Question # 2 Active transport

    A) helps establish the resting potential of a neuron
    B) counters the process of diffusion
    C) allows transport of atoms across the plasma membrane of the neuron against the concentration gradient.
    D) both a and b, but not c
    E) a, b, and c

Question # 3 When a neuron is at rest

    A) there is a voltage difference across the membrane of about -70 millivolts.
    B) the interior is negatively charged.
    C) it is not responding to a stimulus
    D) the fluid outside the membrane has more sodium and less potassium than the cytoplasm.
    E) all of the above

Question # 4 The principal job of the human nervous system is to

    A) facilitate communication among the body systems
    B) store information
    C) replace or repair damaged tissues
    D) provide for defense against pathogens
    E) rid the body of metabolic wastes

Question # 5 At rest, a nerve cell has a high concentration of __________ inside and a high concentration of __________ outside.

    A) acetylcholine; chlorine
    B) sodium; potassium
    C) potassium; sodium
    D) calcium; phosphorous
    E) phosphorus; calcium

Question # 6 The resting potential of a neuron is approximately minus

    A) 70 microvolts
    B) 70 millivolts
    C) 70 volts.
    D) 70 electrovolts.
    E) 70 megavolts.

Question # 7 Which of the following concerning transport proteins in the neuron membrane is true?

    A) Only sodium is transported.
    B) Only potassium is transported
    C) Movement is in response to concentration gradients.
    D) Energy moves ions against the concentration gradient.

Question # 8 Which of the following is NOT true concerning sensory neurons?

    A) They have receptor regions for detection of stimuli.
    B) They lie in the pathway between the interneurons and motor neurons.
    C) They relay information to the spinal cord
    D) They are part of a reflex arc.
    E) They are one of three types of neurons

Question # 9 Functionally speaking, a nerve impulse is

    A) a flow of electrons along the outside of the plasma membrane of a neuron.
    B) the movement of cytoplasmic elements through the core of the neuron.
    C) a series of changes in membrane potentials.
    D) a lengthening and shortening of the membrane extensions of an individual neuron.
    E) a change in the metabolic rate within a neuron

Question # 10 The membrane-bound enzyme system that restores and maintains the resting membrane potential is which of the following pumps?

    A) sodium-phosphorus
    B) sodium-potassium
    C) sodium-chlorine
    D) phosphorus-calcium
    E) phosphorus-chlorine

Question # 11 When an impulse passes from one neuron to the next, it

    A) is passed directly from dendrite to axon
    B) is passed directly from dendrite to axon
    C) can bypass the cell bodies of both
    D) passes from axon to dendrite.
    E) undergoes repolarization

Question # 12 The single long process that extends from a typical motor nerve cell is the

    A) axon.
    B) neuron
    C) synapse
    D) dendrite
    E) both a and d, but not b or c

Question # 13 Within a single neuron, the direction an impulse follows is

    A) dendrite >>> axon >>> cell body.
    B) axon >>> dendrite >>>cell body.
    C) dendrite >>> cell body >>> axon
    D) cell body >>> dendrite >>> axon.
    E) cell body >>> axon >>> dendrite.

Question # 14 Neuroglial cells

    A) metabolically support other neurons
    B) form sheaths around neurons and control the rate of
    C) form more than half of the volume of the brain
    D) provide physical support.
    E) all of the above