chapter 3

Question 1

AP’s are ________ potentials, that is, they occur full blown or not at all.

Answer 1

all or none

Question 2

two kinds of fibers extended from the somas of many neurons: one long ______ and many short bushy _____

Answer 2

axon. dendrites

Question 3

the tiny bulbous ending of axon branches are called

Answer 3

buttons

Question 4

the _____ of a neuron is the large spherical structure that contains its genetic material

Answer 4

nucleus

Question 5

_____ potentials are conducted nondecrementally

Answer 5

action

Question 6

in the cell body, the ______ apparatus packages proteins in vesicles for transport to other parts of the neuron

Answer 6

Golgi

Question 7

the process of neutronsmitter release is called

Answer 7

exocytosis

Question 8

neurotransmitter molecules are often stored in synaptic ______ near the presynaptic membrane

Answer 8

vesicles

Question 9

together the dendrites and cell body are refereed to as the _____ area of neuron

Answer 9

receptive

Question 10

action potentials are generated adjacent to the axon

Answer 10

hillock

Question 11

each synapse is sandwiched between a ____ membrane and a ______ membrane

Answer 11

presynaptic. postsynaptic

Question 12

neutronsmitter molecules once released diffuse across the

Answer 12

synapse

Question 13

prominent in the cytoplasm of the cell body is a system of plate shaped membranous sacs, much of which has a rough appearance. this structure is called the_____

Answer 13

endobiasmic reticulum

Question 14

neurotransmitter molecules bind in a key-in-lock fashion to postsynaptic

Answer 14

receptors

Question 15

the cone shaped junction between cell body and axon is the

Answer 15

axon hillock

Question 16

proteins are synthesized on ______ which give the rough endoplasmic reticulum its rough appearance

Answer 16

ribosomes

Question 17

unlike AP’s, EPSPs and IPSPs are conducted instantly and

Answer 17

decrementally

Question 18

the ____ or soma is the metabolic center of a neuron

Answer 18

cell body

Question 19

conduction in myelinated axon is called_____ conduction

Answer 19

saltatory

Question 20

gaps in the myelin of myelinated axons are called nodes of ____

Answer 20

ranvier

Question 21

in the terminal buttons, the ______ manufactures synaptic vesicles from fragments of button membrane

Answer 21

golgi apparatus

Question 22

_________ myelinate CNS axons

Answer 22

oligodendrocytes

Question 23

_______ receptors are associated with signal proteins and G-proteins

Answer 23

metabotropic

Question 24

_______ are the gill cells that play a role in the blood-brain barrier

Answer 24

astrocytes