Assume That Several Thousand Presynaptic Neurons Synapse with a Single

question 140

Multiple Choice

Assume that several thousand presynaptic neurons synapse with a single postsynaptic neuron.The various presynaptic neurons release ten different neurotransmitters,which are bound by specific (and varying) receptors on the postsynaptic neuron.For an action potential to be generated in the postsynaptic neuron,what must occur?

• A) All neurotransmitter receptors must be ionotropic.
• B) All neurotransmitter receptors must be metabotropic.
• C) All postsynaptic potentials must be greater than the threshold potential.
• D) There must be more IPSPs than EPSPs occurring at the same time and place.
• E) The postsynaptic potentials occurring at a single time must sum to a value greater than the threshold potential.

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Definitions:

Korsakoff's Syndrome

A chronic memory disorder often caused by severe deficiency of thiamine (vitamin B1), usually due to long-term alcohol abuse.

Vitamin B-1

Thiamine, known as Vitamin B-1, is essential for glucose metabolism and plays a critical role in nerve, muscle, and heart function.

Corpus Callosum

A broad band of nerve fibers joining the two hemispheres of the brain, facilitating communication between them.

Confabulation

The production of fabricated, distorted, or misinterpreted memories about oneself or the world, without the conscious intention to deceive.