Lesson Plan of Reflex Action
General Science Grade VIII
Students’ Learning Outcomes
· Explain reflex action with an example.
· Differentiate between voluntary and involuntary action they have experienced.
Information for Teachers
· When a receptor is stimulated, it conducts a signal to the central nervous system, where the brain co-ordinates the reply. But from time to time a very quick response is needed, one that does not need the participation of the brain. This is a reflex action. Reflex actions are quick and occur without us thinking.
· A reflex action is automatic response to specific stimuli.
· The reflex is regarded as the functional unit of the system.
· An involuntary action is an action which takes place without any conscious recognition or control e.g. blinking of eye.
· An action which takes place willingly under the directions from brain is a voluntary action e.g. lifting of book.
Material / Resources
Charts showing the reflex action
Worm up activity
· Create some situation for example by throwing torch light in the eyes of one or two students to react suddenly.
· Teacher will ask questions like:
o What I did?
o What was the reaction of my act?
o Why it happened?
o If my action was not sudden, what could be the reaction?
· After their responses now introduce the today’s topic.
· Show the students chart of reflex action or draw it on the board and explain the reflex action.
· Ask the students to copy on their notebooks, what they understand.
· Now make groups of 3-5 students.
· Ask each group to think of 3 reflex actions other than the already mentioned.
· Ask them that for each action state the precise stimulus name the receptor which first detects this stimulus, name the effect or which reflex action.
· Ask the students about voluntary and involuntary actions.
· After their responses explain these actions.
· Draw a table on the board and ask the students to fill and copy on their notebooks.
· Ask the students to enlist the different voluntary and involuntary actions.
Sum up / Conclusion
· Repeat the important points of the lesson. A reflex action is automatic response to specific stimuli. It is of two types voluntary and involuntary. Voluntary action is that in which will is involved e.g. walking. Catching etc. involuntary action is that in which will is not involved e.g. heartbeat, knee jerk etc.
· Ask the following questions to enhance their learning process:
1. A cricket player injured his lower back but not his legs. However, he could not move his legs. Why is that so?
2. Fatima and Ali are performing two actions. How these actions are similar or different?
o Fatima stretched out her arm to shake hands with Sara.
o Ali suddenly withdraws his hand on touching a hot object.
· Ask the students to prepare chart or model showing reflex action.
· Ask them to bring it the next day and paste the prepared chart in the class.
· Encourage the working of the students in the class.