Brain and Behavior Communication in the Nervous System

Question 1

weight of adult brain

Answer 1

3Ibs

Question 2

nuerons in adult brain

Answer 2

1000 - 10 000 billion

Question 3

What is plasticity

Answer 3

When the brain heals itself

Question 4

When is plasticity most occurrent

Answer 4

in childhood

Question 5

what is a neuron

Answer 5

a nerve cell

Question 6

ions involved in neuron

Answer 6

potassium and sodium (K+ , NA+)

Question 7

all or none principal

Answer 7

the neuron either fires or not

Question 8

Sensory

Answer 8

receive input from environment carry message to brain

Question 9

interneuron

Answer 9

no contact with outside. carry info from one neuron to another

Question 10

Motor Neurons

Answer 10

carry info to nervous system for behavioural response

Question 11

dendrites

Answer 11

receive information from other neurons

Question 12

soma

Answer 12

cell responsible for maintaining the life of cell
(Genetic material)

Question 13

Axon

Answer 13

part of a neuron that serves as the cell’s internal transmitter device

Question 14

meylin sheath

Answer 14

insulating material that protects the axons and helps speed

Question 15

Nodes of Ranvier

Answer 15

space separating the segments of the myelin sheath covering the neurons and also helps increase speed.

Question 16

terminal buttons

Answer 16

tiny swellings at the end of a neuron’s axon

they secrete chemicals when reached by an action potential

Question 17

Synapse

Answer 17

a small gap between terminal button of one neuron and a dendrite of another.

Question 18

pre-synaptic neuron

Answer 18

sends message

Question 19

post-synaptic

Answer 19

receives message

Question 20

neural impulse

Answer 20

possess electrical properties

Question 21

resting potential

Answer 21

the tiny negative electrical charge in place between the inside and outside of the resting room

Question 22

Action Potential (AP)

Answer 22

the electrical signal that travels down a neuron’s axon. (cell becomes less negative)

Question 23

excitatory neurotransmitters

Answer 23

membrane of contracted neuron changes allowing more positive ions into the cell and increases the chances of an AP

Question 24

inhibitory neurotransmitters

Answer 24

the cell membrane either pushes more positive ions out or allows negative ions to move in leading to a decreased action potential.

Question 25

Neurotransmitters

Answer 25

Chemical messengers that relay neural messages across the synapse.

Question 26

reflex

Answer 26

Hammer hitting the knee stimulates sensory neurons causing those cells to being creating action potentials