lecture 2

Question 1

simplest transmission pathways

Answer 1

reflex arcs - chain of neurons that link sensory receptors to motor neurons

Question 2

muscles and neurons

Answer 2

transmit action potentials

Question 3

sensory neuron

Answer 3

somatosensory neuron

a neurone which the sensory terminals are in bodily issues

Question 4

trisynaptic arc

Answer 4

2 interneurons but 3 interconnections

Question 5

disynaptic arc

Answer 5

1 interneuron but 2 interconnections

Question 6

polysynaptic arc

Answer 6

more than 3 interneurons

Question 7

the simplest reflex arc is

Answer 7

monosynaptic - the sensory neutron connects directly to the motor neurone

Question 8

the only monosynaptic reflex arc is

Answer 8

phasic muscle stretch reflex

Question 9

phasic muscle stretch reflex is said to be

Answer 9

spinal - all the neural cell bodies lie within the spinal cord - brain plays no role

Question 10

spinal reflex

Answer 10

a reflex with neural circuitry confined to the spinal cord and body
no brain

Question 11

the sensory neurone cell bodies are in the

Answer 11

dorsal root ganglia

Question 12

motor neurones are located in the

Answer 12

ventral part

Question 13

muscles are made up of

Answer 13

long muscle fibres - responsible for contraction

Question 14

two types of sensory endings

Answer 14

primary- 1a afferent endings

secondary- type 2 afferent endings

Question 15

primary sensory endings

Answer 15

responsive to the SPEED at which a muscle is getting longer

Question 16

Secondary sensory endings

Answer 16

responsive to the AMOUNT the muscle has been stretched

slow adapting properties

Question 17

response strength is measured by the

Answer 17

rate of AP’S - firing rate AP’S per second

Question 18

small stretch

Answer 18

weak stimulus

Question 19

large stretch

Answer 19

strong stimulus

Question 20

quick stretch

Answer 20

strong stimulus - more AP’S fire

Question 21

slow stretch

Answer 21

weak stimulus

Question 22

when the length is not changing

Answer 22

there is little response - fast adapting receptors

Question 23

monosynaptic stretch reflex arc is responsible for

Answer 23

limb jerk reaction/ phasic muscle stretch reflex in response to tendon taps

Question 24

tapping the tendon produces

Answer 24

little change in the length of the quadricep muscles

tapping elicits a knee jerk response

Question 25

if the muscle is not stretched enough to stimulate receptors how can there be a stretch reflex response

Answer 25

because 1a afferent endings respond to the SPEED od the stretch