Exam 7: The Nervous System: Neurons and Synapses

Muscarinic ACh receptors act through ____________ activation of K⁺ channels.

Norepinephrine binding to a receptor stimulates the activity of adenylate cyclase.

Nerve cells depolarize due to the influx of K⁺.

A nerve is a bundle of axons in the CNS.

Both depolarization and repolarization are produced by the diffusion of ions down their concentation gradient.

______ synapses occur between axons of presynaptic cells and dendrites of postynaptic cells.

The disease ______________ is characterized by destruction of CNS myelin sheaths and the formation of hardened scars.

The brain produces lipid neurotransmitters called

Animals that cannot synthesize neuropeptide Y would be prone to seizures.

In a myelinated axon,Na⁺ channels are

Ganglia are clusters of nerve cell bodies located in the peripheral nervous system.

The varied strength of synaptic transmission is called

Both long-term potentiation and long-term depression requires release of ___ from the postsynaptic neuron membrane.

Which of the following is NOT true of long-term potentiation (LTP)?

Myelinated axons transmit action potentials more rapidly than unmyelinated axons.

Sensory neurons for muscle position are the fastest conducting neurons.

Which of the following is NOT true of dendrites?

Which of the following is NOT true of nicotinic-gated channels?

Which poison inhibits glycine receptors?

The gap of exposed axon in the myelin sheath is the