Stimulus response process

Question 1

Define stimulus

Answer 1

A stimulus is any change in the internal or external environment

Question 2

Define receptor

Answer 2

A special type of nerve cell that may be located in sense organs. Different types of receptors respond to particular stimuli.

Sense organs include our eyes, ears, nose tongue and skin.

Question 3

Identify the 4 different types of receptors

Answer 3

Mechanoreceptors
Chemoreceptors
Thermoreceptors
Photoreceptors

Question 4

What stimuli do mechanoreceptors respond to and where is it in the body?

Answer 4

• Pressure (touch) and sound
• Skin and ear

Question 5

What stimuli do chemoreceptors respond to and where is it in the body?

Answer 5

-Chemicals
- Tongue and nose

Question 6

What stimuli do thermoreceptors respond to and where is it in the body?

Answer 6

-Temperature
- Skin

Question 7

What stimuli do photoreceptors respond to and where is it in the body?

Answer 7

• Light
• Eye

Question 8

Define the effector

Answer 8

A muscle, or gland that receives the message from the central nervous system to respond in a particular way.

Their response depends on the original stimulus.

Question 9

What are the two types of feedback?

Answer 9

NEGATIVE FEEDBACK
Most common
Aims to REDUCE the stimulus

POSITIVE FEEDBACK
Uncommon
Aims to INCREASE the stimulus (take away from homeostasis)

Question 10

Examples of negative feedback:

Answer 10

Glucose regulation

Temperature regulation

Blood pressure

Blood pH

Question 11

Recall the process of homeostasis through the stimulus-response model

Answer 11

Stimulus –> Receptor —> Control centre (cns) —> Effector –> Response