Coordination and Response (animals) Pg45-50

Question 1

what is a stimulus

Answer 1

a change in the internal or external environment

Question 2

what are receptors

Answer 2

receptors detect stimuli, group of cells that detect external stimuli

Question 3

what are effectors

Answer 3

effectors are cells that bring about a response to a stimuli. e.g. muscle cells and glands (muscles contract, glands secrete hormones)

Question 4

what are the 2 central nervous systems (CNS)

Answer 4

brain and spine

Question 5

what are the three main types of neurones

Answer 5

sensory, relay and motor

Question 6

name the full process of the nervous system

Answer 6

• receptors detect a stimulus
• they send electrical impulses along the sensory neurones to the CNS
• uses neuro-transmitter to diffuse across the synapse to the the relay neuron
• then sends electrical impulses along relay neurons axon across a synapse using neuro-transmitters to the motor neurons
• motor neurons sends electrical impulses to an effector

Question 7

what is a synapse

Answer 7

• the connection between two neurons is called a synapse
• the nerve signal is sent by a chemical called neurotransmitters which diffuse across the gap
• these chemicals set off another electrical impulse to the next neuron

Question 8

why do reflexes help

Answer 8

helps prevent injury and further damage