chapter 35

Question 1

which multicellular animals don’t have a nervous system?

Answer 1

sponges

Question 2

what can neurons connect?

Answer 2

nerve nets, ganglia, and brains

Question 3

what are the three types of neurons?

Answer 3

sensory, inter, and motor neuron

Question 4

all types of neurons share the same 3 main components of:

Answer 4

dendrites, cell body, and axons

Question 5

which neuron is this? : send and receive info about an animal’s environment or its internal physiological state

Answer 5

sensory
- they also respond to physical features such as temperature, light, and touch.
- they also respond to chemical signals such as odor and taste.

Question 6

which neuron is this? : processes the info received by sensory neurons and transmit it to different body regions.

Answer 6

interneurons

Question 7

which neuron is this? : produce a motor response based on info received from sensory and interneurons

Answer 7

motor neurons

Question 8

what common feature(s) is/ are consistent across all three types of neurons?
a. the shape of the cell body
b. the branching patterns of dendrites and axons
c. the presence of axons and dendrites

Answer 8

c. the presence of axons and dendrites

Question 9

what do all neurons have?

Answer 9

dendrites, a cell body and axon

Question 10

signals from multiple dendrites and the cell body are combined at the junction of the cell body and its axon, and area known as the…

Answer 10

axon hillock

Question 11

what is the function of a synapse?

Answer 11

communicates with neighboring cell

Question 12

explain an action potential

Answer 12

a brief electrical signal transmitted from the cell body along one or more axon branches

Question 13

what and where does the action potential release?

Answer 13

they happen at the axon terminal, and they cause the release of neurotransmitters

Question 14

neurotransmitters are a form of [blank] signaling
while action potentials are a form of [blank] signaling

Answer 14

chemical, electrical

Question 15

neuronal stimuli are received by :
a. dendrites
b. axons
c. neurotransmitters
d. cell nuclei

Answer 15

the answer is A

Question 16

what is the cell’s resting membrane potential

Answer 16

when the negative voltage across the membrane is at rest

Question 17

what as the resting membrane potential created by?

Answer 17

by sodium and potassium movement by the Na+/K+ pump AND the leak of K+ out of the cell at rest

Question 18

the resting membrane potential of a neuron is determined by :
a. movement of potassium(K+) ions relative to other ions
b. negatively charged proteins on the outside of the cell
c. activation of voltage-gated sodium(Na+) channels
d. diffusion of potassium(K+) ions through sodium (Na+) ion channels.

Answer 18

the answer is A

Question 19

the increase in membrane potential is referred to as [blank] of the membrane

Answer 19

depolarization

Question 20

when a nerve cell is excited, its membrane becomes less negative

Answer 20

notes

Question 21

a higher frequency codes for a more [blank] stimulus such as blank

Answer 21

intense, such as brighter light or louder noise, or a stronger signal transmitted by the nerve cell to other cells it contacts

Question 22

what are glial cells?

Answer 22

cells that neurons are supported by, they provide insulation, and nutrition
they also provide electrical

Question 23

action potentials are self propagating, they propagate only in one direction, normally from the cell body at the axon hillock to the axon terminal

Answer 23

notes

Question 24

what does the myelin sheath do?

Answer 24

it insulates the axon