The nervous system

Question 1

What is a stimuli

Answer 1

a change in the environment

Question 2

What is a receptor

Answer 2

cells in sensory organs that detect changes in the environment

Question 3

What is a coordinator

Answer 3

what processes information and decides how the body should respond (CNS)

Question 4

What is an effector

Answer 4

what carries out the action, could be a muscle contracting or a gland secreting

Question 5

what is a response

Answer 5

the action carried out by the effector

Question 6

describe the process in the nervous system that occurs when a stimuli is detected

Answer 6

stimuli occurs

receptors detect the stimuli

sensory neutrons carry messages from the receptors to coordinator

coordinator (cns) makes a decision

motor neurone carry message from coordinator to effector

effector contracts or secretes chemical

that action carried out is the response

Question 7

stimuli—> receptors–?->coordinator–?-> effector—>response

which neurons carry these messages

Answer 7

the sensory neuron

the motor neuron

Question 8

what are 3 ways neutrons are adapted

Answer 8

• long to carry impulses quickly over large distances
• dendrites increase surface area to receive impulses as quickly as possible
• myelin sheath is made out of fat which is an insulator, impulses jump between gap meaning they’re quicker

Question 9

what is the order of a reflex arc

Answer 9

stimuli->receptors->sensory neuron-> relay neuron-> motor neuron-> effector -> response

Question 10

describe what happens in a reflex arc

Answer 10

stimuli is detected by receptors

the sensory neuron carries messages to the relay neuron

the relay neuron carries it to the motor neuron

the motor neuron carries the message to the effector

this leads to a response

Question 11

what happens at a synapse

Answer 11

when an electrical impulse arrives at a synapse it triggers sacs to release chemicals called neurotransmitters

they diffuse across the cell and bind to chemical receptors on the next neuron