| A | B |
|---|
| The interaction function consists of three processes | the perception of information, processing and coordination, and the execution of responses |
| What is a stimulus? | Any change in the surroundings or in the living thing itself which can be perceived by it and cause an effect in it. |
| What are the two types of stimuli? | Physical stimuli and chemical stimuli |
| Give an example of Physical Stimuli | energy, such as heat, light, vibrations and forces such as gravity |
| Give an example of Chemical Stimuli | substances of all kinds |
| What do photoreceptors do? | They capture light. |
| What do thermoreceptors do? | They detect heat. |
| What do mechanoreceptors do? | They are sensitive to vibrations and forces. |
| What do chemoreceptors do? | They detect substances. |
| How do living things process the information which comes from the receptors? | Through a coordinated response. (various parts which work together) |
| How many response processes do unicellular organisms carry out? | Three. All within their single cell. All they do is coordinate their cell structures. |
| Can multicullular organisms respond to stimuli individually? | Yes, but communicate and coordinate so that the WHOLE organism carries out the response. |
| What do we call the thing that living things have to carry out responses? | effectors |
| Name the two types of responsibilities the book mentiones for effectors | producing movements, substances |
| Describe the perception of information | The receptors of living things capture information about their surroundings. They then send signals to the processing and coordination centres. |
| How does processing and coordination work? | The coordination centres process the signals from the receptors and produce a response which is sent as signals to the effectors. |
| How does the execution of responses work? | The effectors receive the signals from the coordination centres and they give the response. |
