The document discusses stimuli and responses. It defines a stimulus as something that causes a response and gives an example of a hot pan being a stimulus that causes the response of pulling one's hand away. It explains that external stimuli come from outside the body and lists the parts of the human body that can detect external stimuli, such as the eyes, skin, nose, ears, and tongue. It prompts drawing pictures showing examples of stimuli and responses and labeling whether the stimulus is internal or external.

1. Lesson 2: Stimuli
Foundation
Science
SC 22101

2. What is a Stimulus?
Stimulus – something that causes a response.

3. Stimulus and Response
Stimulus – hot pan
Response – quickly pull hand away
Draw picture in your notebooks and write the
stimulus and the response. Example……
Stimulus
Response

4. Stimulus and Response
Draw picture in your notebooks and write the
stimulus and the response.
Stimulus – ?
Response – ?
Internal or external stimulus?
Stimulus
Response

5. External Stimuli
Stimuli that are present outside of the body
are called external stimuli.
What parts of a human body detect external stimuli?
TongueEyes
Skin
NoseEars

6. Stimulus and Response
Draw picture in your notebooks and write the
stimulus and the response.
Stimulus – ?
Response – ?
Internal or external stimulus?
Stimulus
Response

7. Stimulus and Response
Draw picture in your notebooks and write the
stimulus and the response.
Stimulus – ?
Response – ?
Internal or external stimulus?
Stimulus
Response

8. Stimulus and Response
Draw picture in your notebooks and write the
stimulus and the response.
Stimulus – ?
Response – ?
Internal or external stimulus?
Thirsty man looks
for water.

9. Stimulus and Response
Draw picture in your notebooks and write the
stimulus and the response.
Stimulus – ?
Response – ?
Internal or external stimulus?
Thirsty man looks
for water.

10. Questions
1. What does response mean?
2. What does the prefix “photo” mean? What does the suffix
“tropic” mean?
3. Use the prefix and suffix from question 2 to tell me what
phototropic means. Did we see a picture of a phototropic
plant in class today?