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Spinal Cord

we suddenly w...

Question

we suddenly withdraw our hand when a pin pricks. name the type of response involved in this action?

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Solution

Reflex action.

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Q. On touching a hot plate, we suddenly withdraw our hand. List two categories of neurons which become active. Describe this 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. In cold weather, we rub our hands to warm them. The force involved in this is:

What is the stimulus in case of a pin-prick on our finger?

Why do we see this happening?

(a) People look up when an aeroplane passes overhead, high up in the sky.

(b) When a beam of light flashes on the eyes, the eyes close quickly.

(c) When there is the slightest sound, a cat pricks up its ears.

(d) If somebody shouts suddenly right behind us, we get startled.

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