Chapter 3: Signaling by NTs and Hormones

Question 1

A chemical that activates a receptor

2 examples

Answer 1

Agonist

Ex: Heroin. Cocaine- indirect agonist

Question 2

A chemical that occupies the agonist site but produces no action at the receptor
2 examples

Answer 2

Antagonist

Ex: Naloxone. Botulinum Toxin - indirect antagonist

Question 3

The point of communication between neurons

Answer 3

Synapse

Question 4

Transmission occurs in only one direction*

From the _____ cell to the _____ cell.

Answer 4

Presynaptic; postsynaptic

Question 5

Terminal boutons of the presynaptic cell contain _____

Answer 5

Synaptic vesicles filled with NT

Question 6

Glia offers support to the _____

Glial cells speed up transmission from one neuron to another by providing _____

Answer 6

CNS

A physical barrier so that NT cannot leak out everywhere

Question 7

The synapse is surrounded by processes from _____

Answer 7

Astrocytes (glial cells)

Question 8

Numerous mitochondria in the axon provide _____ for ion pumping and transmitter release.

Answer 8

ATP

Question 9

A presynaptic axon terminal bouton communicates with a dendrite of the postsynaptic cell.
The gap between cells, or synaptic cleft, is very ____, about 20 nm

Answer 9

Axodendritic synapses

Small