Biology

Urea is produced in the A) liver from NH3 and CO2. B) liver from glycogen. C) ki

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In certain large animals, this type of neuron can extend beyond 1 meter in lengt

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The nucleus and most of the organelles in a neuron are located in the A) dendrit

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Most of the neurons in the human brain are A) sensory neurons. B) motor neurons.

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A simple nervous system A) must include chemical senses, mechanoreception, and v

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An action potential can start in the middle of an axon and proceed in both oppos

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Immediately after an action potential passes along an axon, it is not possible t

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The "undershoot" phase of after-hyperpolarization is due to A) slow opening of v

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After the depolarization phase of an action potential, the resting potential is

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A toxin that binds specifically to voltage-gated sodium channels in axons would

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Action potentials move along axons A) more slowly in axons of large than in smal

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The "threshold" potential of a membrane A) is the point of separation from a liv

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A "resting" motor neuron is expected to A) release lots of acetylcholine. B) hav

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The "selectivity" of a particular ion channel refers to its A) permitting passag

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Self-propagation and refractory periods are typical of A) action potentials. B)

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A graded hyperpolarization of a membrane can be induced by A) increasing its mem

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Opening all of the sodium channels, with all other ion channels closedwhich is

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Two fundamental concepts about the ion channels of a "resting" neuron are that t

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ATP hydrolysis directly powers the movement of A) K+ out of cells. B) Na+ out of

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The membrane potential that exactly offsets an ion's concentration gradient is c

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A cation that is more abundant as a solute in the cytosol of a neuron than it is

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The operation of the sodium-potassium "pump" moves A) sodium and potassium ions

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Although the membrane of a "resting" neuron is highly permeable to potassium ion

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) For a neuron with an initial membrane potential at -70 mV, an increase in the

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In the communication between a motor neuron and a skeletal muscle, A) the motor

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