On touching a hot plate, we suddenly withdraw our hand. List two categories of neurons which become active. Describe this process?

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Solution

Due to touching the plate, an impulse is registered from our sensory organs to our Sensory Neurons. From there, the impulse travels to the Central Nervous System (Spinal Cord), where the appropriate action takes place. After that, the impulse is transferred back to the muscle, using the motor neuron. As this is an immediate action, we can call this type of process by calling it a Reflex Action. The neural process which produces it is known as a Reflex Arc.

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Similar questions

When we touch a hot plate unknowingly, then this heat is sensed by a receptor P present in our fingers. The receptor triggers an impulse in neuron Q which transmits the message to an organ R which is a part of the central nervous system. Here the impulse is passed on to a neuron S which in turn passes it to a yet another neuron T. The neuron T passes the impulse to a tissue U in our arm. The tissue U then contracts and pulls our hand away from the hot plate.

(a) What is the name of (i) receptor P (ii) neuron Q, and (iii) organ R ?

(b) What is (i) neuron S, and (ii) neuron T ?

(d) What name is given to the phenomenon in which hand is pulled away quickly from the hot plate ?

(e) Name the effector in this whole process.

Q. A person unconsciously withdraws his hand suddenly with a jerk, after touching a hot plate
(i) Draw a schematic diagram of the nervous pathway involved in this response.

(ii) What is such a response called?

(iii) How is this kind of response different from the one in which one begins to salivate at the sight of tasty food?

Q. Blinking when a beam of light is suddenly focussed on the eyes and sudden withdrawal of hand upon touching a hot body are some of the examples of reflex actions. Which part of the central nervous system acts as the centre these actions?

Q. A sudden and spontaneous reflex which leads to the quick pulling of hand on touching a hot object is generated by
I. Brain
II. Spinal cord
III. Sensory neurons
IV. Motor neurons

Q. How do the following processes occur? We move our hand away from a hot object.

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