Nerves

Question 1

what is the activation of neural pathways by stimuli that damage or threaten to damage tissues?

Answer 1

nociception

Question 2

what is a potentially damaging stimulus?

Answer 2

noxious stimulus

Question 3

what is a stimulus that activates nociceptive pathways?

Answer 3

nociceptive stimulus

Question 4

what is the physiological mechanism for pain sensation?

Answer 4

nociception

Question 5

what is the sensation for thermoreceptor?

Answer 5

hot and cold

Question 6

what is the physiological mechanism for touch?

Answer 6

mechanoreception

Question 7

what is the physiological mechanism for position sense?

Answer 7

proprioception

Question 8

what is the sensation for gustation?

Answer 8

taste

Question 9

what is the sensation for olfaction?

Answer 9

smell

Question 10

are chemical signals slow or fast?

Answer 10

slow

Question 11

are electrical signals slow or fast?

Answer 11

fast

Question 12

what are short distance electrical signals?

Answer 12

graded potentials

Question 13

what are long distance electrical signals?

Answer 13

action potentials

Question 14

what is the resting membrane potential?

Answer 14

-70mv

Question 15

what changes electrical potentials?

Answer 15

ion permeability
ion concentration gradient

Question 16

are nerves more permeable to potassium or sodium?

Answer 16

potassium

Question 17

what is the ratio of sodium to potassium?

Answer 17

3Na: 2K

Question 18

What type of energy does the sodium potassium pump require?

Answer 18

ATP

Question 19

What does the sodium potassium pump transport?

Answer 19

Na OUT of cell
K IN to cell

Question 20

what happens at resting membrane potential?

Answer 20

membrane permeable to potassium

Question 21

what causes depolarisation to threshold?

Answer 21

voltage gated Na channels open

Question 22

what causes a rapid depolarisation overshoot

Answer 22

Na flows into axon

Question 23

what happens after Na flows into axon?

Answer 23

K channels start to open and Na channels inactivate

Question 24

what causes the rapid repolarisation?

Answer 24

K flows out

Question 25

what causes below threshold hyperpolarisation?

Answer 25

K channels close Na channels reset

Question 26

what makes AP only travel in one direction?

Answer 26

refractory periods

Question 27

if you increase the width of an axon you get... resistance and ... conduction?

Answer 27

lower faster

Question 28

what does myelination result in?

Answer 28

faster conduction

Question 29

what nerve fibres are the thinnest?

Answer 29

C

Question 30

what nerve fibres are the thickest?

Answer 30

Aalpha

Question 31

what nerve fibres are the fastest?

Answer 31

Aalpha