STIMULUS AND RESPONSE

Why animals and plants do what they do?

OR

CAUSE AND EFFECT in plants and animals

• Describe a situation in which you were immediately scared and/or reacted quickly to something

• Write 4 sentences describing it:• First…• Second….• Then….• Finally…..

WHAT IS A STIMULUS ?

• STIMULUS: any action that makes and organism to react. That is cause

• Stimulus : singular• Stimuli: plural• Example: Give us an example!!!

WHAT IS A RESPONSE?

• RESPONSE: how the organism reacts to an stimulus and changes in behaviour. That is an effect

• Ex: • Give us an example!!!

Examples of stimuli and their responses:

There are two types of stimuli:

EXTERNAL STIMULI

AND

INTERNAL STIMULI

External Stimulus:

• External Stimulus: a stimulus that comes from the outside an organism

• Examples:

Internal Stimulus:

• Internal Stimulus: a stimulus that comes from inside an organism

• Examples:

Decide whether these stimuli are internal or external

The external receptors are in the sense organs

There are two types of responses

MUSCULAR RESPONSE AND GLANDULAR RESPONSE

Muscular response

• Muscular response: a response made by the muscles

• Examples:

Glandular response

• Glandular response: substances produced by the glands

• Examples:

Summarize what you have learned • 1.-What is a stimulus?• 2.- What is a response?• 3.- Give an example of a stimulus and its response• 4.- What is an internal stimulus?• 5.- What is an external stimulus?• 6.-It´s raining and you open up an umbrella. Is this an internal

or external response ? Why?• 7.- What are the external receptors?