5.1.2 the reflex arc

Question 1

does a reflex involve the CNS

Answer 1

response does not involve the conscious part of the brain as the coordinator of the reaction

Question 2

when does a reflex happen

Answer 2

happens after the response has been carried out

Question 3

how does this reduce the amount of damage

Answer 3

because responses are automatic and rapid

Question 4

1.what is the stimulus

Answer 4

something that causes a reaction like a pin in ur foot and is picked up by the receptor on the skin

Question 5

2.what happens after the stimulus

Answer 5

sensory neurone sends electrical impulses to the spinal cord (the coordinator)

Question 6

3.where does the electrical pulse go

Answer 6

goes through the a relay neurone in the spinal cord

Question 7

4.what does the relay neurone do

Answer 7

the relay neurone synapses with a motor neurone

Question 8

5.what does the motor neurone do

Answer 8

the motor neurone carries an impulse to a muscle in the leg (the effector)

Question 9

6.what does the effector cause

Answer 9

this causes the leg to pull away form the pin after being stimulated by the neurone

Question 10

what are the three main types of neurone in the sensory arc

Answer 10

sensory, relay, motor

Question 11

what does the sensory neurone do

Answer 11

carries impulses from sense organs to the CNS

Question 12

what dos the relay neurone do

Answer 12

found inside the CNS and connect sensory and motor neurones

Question 13

what does the motor neurone do

Answer 13

carries impulses from the CNS to effectors (muscles or glands)

Question 14

what does the sensory neurone look like

Answer 14

long and have a cell body branching off the middle of the axon

Question 15

what does the relay neurone look like

Answer 15

short and have a small cell body at one end with many dendrites branching off it

Question 16

what does the motor neurone look like

Answer 16

long and have a large cell body at one end with long dendrites branching off it

Question 17

what is the synapse

Answer 17

synapses are the gaps that don’t allow neurones to touch and electrical impulses can’t cross them

Question 18

where are synapses located

Answer 18

between the sensory and relay neurones, and the relay and motor neurones

Question 19

what are neurotransmitters

Answer 19

chemicals that are released into the synaptic cleft and diffuse across it (down a concentration gradient)

Question 20

what is the slowest part of a reflex arc

Answer 20

Diffusion of neurotransmitters across the synaptic cleft