neurotransmission speeds

Question 1

describe how the nervous system responds to stimuli

Answer 1

stimulus-receptor- sensory neurone-CNS- motor neuroneeffector

Question 2

describe the structure of motor neurones and relay neurones

Answer 2

sensory neurones - LONG DENDRON carries nerve impulses from RECEPTOR CELLS to the CELL BODY
SHORT AXON carries impulses from CELL BODY - CNS
motor neuron - short dendrites carry impulses from CNS-CELL BODY
axon carries impulses from cell body - motor neurones

Question 3

explain how motor neurones are adapted to their function

Answer 3

covered with ion channels, which open in response to electrical signals from the brain

Question 4

action and function of synapase

Answer 4

connection between two neurones,
the nerve signal is transferred by chemicals called NEUROTRANSMITTERS which DIFFUSE across the gap -
set of a a NEW ELECTRICAL SIGNAL in the NEXT neurone
TRANSMISSION of nervous impulse v fast - slowed down a bit at the syn bc diffusion across the gap takes time

Question 5

explain how the structure of the reflex arc allows a faster response

Answer 5

allows faster actions by activating spinal motor neurons instead of delaying reaction time by signals first having to go to the brain.

Question 6

describe the structure and function of the reflex arc

Answer 6

reflex arc is the pathway that information follows in a reflex, including the sensory neurons that detect the stimulus, the interneurons that process the information, and the motor neurons that transmit the information to the effector to produce a response.