5.1 Stimuli and response

• Biologie
• Middelbare school
• havo
• Leerjaar 1

Put the following words in the correct order. Start with the word: stimulus. 

Stimulus

Sensory receptor

Neurons

Effectors

Respons

stimuli and responses

stimulus

sensory receptor

neurons

effectors

response

NOTICE CHANGES IN AND AROUND US

• why? to survive
• what? stimulus/stimuli
• stimulus =  external or internal change that causes a reaction

When there’s rain, the frog tends to come out because it prefers a wet environment.

Responding to stimuli

1. Your phone rings. The sound of the phone ringing is a stimulus.
2. Sensory receptors in your ear receive the sound and change it into nerve impulses.
   
3. The nerve impulses travel along neurons to your brain: you become aware of your phone ringing.
   
4. The brain sends its own nerve impulses along other neurons to your arm muscle.
   
5. Your arm muscle contract and you pick up the phone. Your muscles are called effectors because they make the response possible.

How does the nervous system work?

Sensory receptors can receive stimulus from outside or inside your body  (for example chocolate)

Sensory receptors                                                                                                                        = impulses                   nerves   

     brain    

 muscles

stimulus => response

stimulus = external or internal change that causes a reaction

sensory receptors = convert stimuli into electrical signals

nerve impulse = electrical signals in neurons

neurons = send and receive electric signals (nerveimpulses)

effectors = are told how to react by your brain (via impulses through neurons)  that's your response

response = reaction to a stimulus

Talking point

Discuss with a classmate why being able to see is important for the survival of many animals. What would happen if the animal could not see anything? Then also discuss why being able to smell, hear, feel and taste are important for survival.

HW 5-4-'22

glossary task:

8 bold words from textbook 5.1 

fill out glossary for these 8 bold words

5.1 Stimuli and response

Tell me your answers.

Discuss

How do you notice changes around you?

How do you notice the changes around you?

Michel is working with the bunsen burner. 

He touches the barrel.

How does he notice the change and respond ? 

write down all the steps

5.2 the senses

Read 5.2

make workbook 5.2

check your work

DONE? go to your teacher

1

2

3

4

5

Your phone rings. The sound of the phone ringing is a stimulus.

Sensory receptors in your ear receive the sound and change it into nerve impulses.

The nerve impulses travel along neurons to your brain: you become aware of your phone ringing.

The brain sends its own nerve impulses along other neurons to your arm muscle.

Your arm muscle responds by contracting and you pick up the phone. Your muscles are called effectors because they make the response possible.

stimulus

sensory receptors

nerve impulse

neurons

effector

external or internal change that causes a reaction

convert stimuli into electrical signals 

electrical signals in neurons 

cells that send and receive electric signals

muscles or glands, are told how to react by your brain (via impulses through neurons)