Organization and Cells of the Nervous System

Nicotinic receptors utilize G-proteins to regulate the opening of ion channels.

False

The blood-brain barrier results mostly from the action of ____ a type of neuroglia.

astrocytes

Astrocytes

star-shaped supporting cells in the brain and spinal cord that feed, clean, and protect nerve cells (neurons)

Clusters of nerve cell bodies located in the peripheral nervous system

Ganglia

which type of cell lines the ventricles of the brain and helps produce cerebrospinal fluid?

ependymal cells

T or F: the nicotinic ACh receptor is a ligand-gated channel

true

Which poison inhibits glycine receptors?

strychnine

what is not true of the relative refractory period?

Na+ channels are inactivated

From which amino acid are dopamine, norepinephrine and epinephrine all derived?

tyrosine

ion channels that open in response to depolarization are called ___

voltage-gated channels

Astrocytes are not involved in

breakdown and engulfment of foreign material in the CNS.

Microglia

perform phagocytosis; they break down and engulf foreign material, damaged cells, and debris in the CNS.

Glycine and GABA act as inhibitory neurotransmitters in the CNS because they bind to Cl- channels on

A bundle of axons in the CNS is called a

tract

T or F: Parkinson’s disease is associated with the loss of dopaminergic neurons

true

A drug that blocked ligand gated ___ channels would prevent neuron ____

Na+, depolarization

T or F: A lack of extracellular Ca2+ would cause increased release of neurotransmitters

false