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18 Cards in this Set

  • Front
  • Back

What is the thing called that triggers a response in a reflex arc?

Stimulus

What are receptors?

Organs that receive the stimulus

What are the five receptors called?

Eyes (see the stimulus)


Ears (hear the stimulus)


Skin (feel the stimulus)


Nose (smell the stimulus)


Tongue/mouth (taste the stimulus)

When the receptor has received the stimulus, what is the neurone called that carries the nerve impulse to the central nervous system?

Sensory neurone

What is at the end of the sensory neurone?

Synapse

What does the synapse do?

Holds chemicals that diffuse across the gap between the synapse and next neurone

Which neurone is one the other side of the first synapse?

Relay neuron

What happens when the impulse reaches the end of the relay neurone?

The impulse reaches the synapse and is diffused across the gap by the chemicals there

Which neurone is on the other end of the second synapse?

Motor neurone

What happens when the impulse reaches the motor neurone?

It travels along it until it reaches the next stage

What comes after the motor neurone in the reflex arc?

Effector

What is the effector?

Either a muscle or gland that will respond physically to the stimulus

If the effector is a muscle what does it do when the impulse reaches it?

Contract to respond to the stimulus

If the effector is a gland what does it do when the impulse reaches it?

Secretes a hormone to respond to the stimulus

What is the movement by the effector muscle/gland called?

Response

What is a reflex arc?

A response to a stimulus that you don't have to think about first

Why are reflex arcs quicker than normal responses?

You don't have to think about them first, which takes time


What are the seven steps to a reflex arc?

1) Stimulus


2) Receptor


3) Sensory Neurone


4) Relay Neurone


5) Motor Neurone


6) Effector


7) Response