LAB #1-2

Question 1

sensory receptor adaptation

Answer 1

if stimulus is prolonged in duration the sensory receptor firing rate will decline over time
ex. human volunteer, the paper onto of the hand(Pacinian corpuscles-stretch receptors)

Question 2

firing rate

Answer 2

action potential/seconds
high firing rate- large leg movement
low firing rate-small leg movement
-sensory receptors in animals change in firing rate to encode info about stimulus intensity

Question 3

stretch receptors

Answer 3

are used to detect the posotion of the leg as the cockroach moves

Question 4

the lab 2 exercise

Answer 4

labscribe-will record and display actual nerve action potential from axons of the sensory neuron in the cockroach leg
-as the leg moves from a neural position the sensory neuron increases the rate at which it generates AP’s

Question 5

mechanoreceptors

Answer 5

are specialized nerve cells that respond to touch pressure sound movement and stretch
-detect both external and internal stimuli
-internal-provide info about muscle position contraction movement as well as legs in space=proprioreceptors
external-vibrations sound wind touches water, those that are transmitted through he substrate(electronics..)

Question 6

cockroaches mechanoreceptors

Answer 6

found on cuticles, or exoskeleton of legs
1-short hairs
                 =setae
2-clusters of hairs called 
                 =hair plates..
3-dome like structors called
                = campaniform sensilla
4-strusturs under cuticle called 
               =chordotonal prgans

Question 7

faraday cage

Answer 7

is grounded, screen enclosure around the preparation and the electrodes- sepearates the source of the radiation from the electrodes
–reducing pick up

Question 8

pick ups and ground loops

Answer 8

pick ups covered by the faraday cage
ground loops-troublesome source of electrical noise
-using simple cables equipped eith alligator clips…to avoid ground loops
grounding cable places through the coxa and into balsa wood

Question 9

metathoracic legs

Answer 9

cockroaches hind legs

they move it forward

Question 10

coxa

Answer 10

upper portion of leg- attatches leg to thorax

Cockroach

Question 11

trochanter, fibia and tibia, tarsus

Answer 11

act as a knee and lets it bend
resembles thigh and shin bones
ankle and foot
–Cockroach

Question 12

to calculate firing rate

Answer 12

count number of action potentials on screen and divide that by recording time in seconds…each sweep of data was 500ms in duration…

Question 13

Phasic

Answer 13

if firing fate ceases or is greatly reduced when movement of the receptors stops, even through new position is maintained -response considered phasic

Question 14

tonic

Answer 14

is action potentials continue for as long as the stimulus is maintained and slowly declined overtime

Question 15

phasictonic

Answer 15

if initial response to a stimulus is a burst of action potentials which is immediately followed by large drop in firing rate that settles into a tonic patter as the stimulus is maintained the response is phasictonic…