Ch 48 Pt 1

Question 1

Which organ system originated from the mesoderm

Answer 1

Circulatory system

Question 2

Role of the Nervous system

Answer 2

Integrate information and make appropriate responses

Question 3

CNS

Answer 3

Encased in bone

Brain and spinal cord

Question 4

PNS

Answer 4

Nerves

Question 5

Neuron

Answer 5

Functional unit of the nervous system

Question 6

Neuron Functions

Answer 6

Process information
Sense environmental changes
Communicate changes to other neurons
Command body responses

Question 7

___ -> Cell body -> ___ -> terminal

Answer 7

Dendrite

Axon

Question 8

Number and complexity of dendrites is correlated with

Answer 8

Amount of input the neuron receives

Question 9

Glia

Answer 9

Support cells

Question 10

Functions of the glia

Answer 10

Structure
Chemical support
Insulates neurons
Forms blood-brain barrier
Guide neuronal migration and growth

Question 11

Electrical signals

Answer 11

Action potential within a single neuron

Question 12

Chemical signals

Answer 12

Neurotransmitter release between neurons

Question 13

Transduction

Answer 13

Conversion of energy from one form to another

Question 14

Synapse

Answer 14

Site of communication

Question 15

Charged particles needed to produce an electric current

Answer 15

Na+ K+ Cl-

Question 16

Separation of charge

Answer 16

Cell membrane and intracellular and extracellular fluid

Question 17

Membrane potential

Answer 17

Potential difference across plasma membrane

Question 18

Resting potential

Answer 18

Not actively signaling

-70mV

Question 19

Action potential

Answer 19

Active signaling

> 0 mV

Question 20

Depolarization

Answer 20

-20mV

Activation/increased activity

Question 21

Hyperpolarization

Answer 21

-90mV

Inhibition/decreased activity

Question 22

Ion gates and channels are needed to maintain

Answer 22

Action potential

Question 23

Leak channels

Answer 23

K+ and Cl-

Question 24

Voltage gated channels

Answer 24

Na+

Question 25

Ion pumps (require ATP)

Answer 25

Na+ out | K+ in

Question 26

3 forces that move ions

Answer 26

Concentration gradient Electrical force Active transport

Question 27

Concentration gradient

Answer 27

Chemicals move from high to low concentration

Question 28

Na+ always wants

Answer 28

In

Question 29

Equilibrium potential

Answer 29

No net movement ``` K+ = -80mV Cl- = -65mV Na+ = +62mV ```

Question 30

Which is not directly responsible for producing membrane potentials

Answer 30

Diffusion

Question 31

Driving force

Answer 31

Difference between where the membrane is and where the ion wants to be

Question 32

Action potential

Answer 32

Brief change in voltage from negative to positive spike, nerve impulse, etc