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प्रश्न
What is meant by receptors and effectors? Give two examples of each.
उत्तर
A receptor is a cell present in the sense organs that is sensitive to specific stimuli. Example: The eyes have light receptors which can detect light and the ears have sound receptors which can detect sound.
An effector is a part of body which can respond to a stimulus according to the instructions given from the nervous system.
Example: Muscles and glands of the human body.
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संबंधित प्रश्न
Briefly explain the following terms : Reflex action
Give three examples of reflex actions.
Fill in the following blank with suitable word :
A neuron which carries an impulse to the brain is called a ........... neuron.
The contraction of pupil of the eye in the presence of bright light is an example of :
(a) Voluntary reflex
(b) Spinal reflex
(c) Cerebral reflex
(d) Adrenal reflex
A cylindrical structure P in our body begins in continuation with medulla and extends downwards. It is enclosed in a bony cage Q and surrounded by membranes R. As many as x pairs of nerves arise from the structure P. The structure P is involved in the reflex actions of our body and conduction of nerve impulses to and from another organ S of our body with which it forms CNS.
(a) Name the structure P.
(b) Name (i) bony cage Q, and (ii) membranes R.
(c) How much is x?
(d) Name the organs S.
(e) What are the reflexes involving structure P only known as?
List in tabular form two differences between reflex action and walking.
Complete the following sentence with appropriate Word
Which of the following is not a natural reflex action?
What will you do if someone pricks your hand with a needle? Elucidate the pathway of response with a neat labelled diagram.
If after cutting through dorsal root of a spinal nerve of a mammal, the associated receptor in skin was stimulated the animal would ______.
Categorise the following under stimulus and response.
Pain in the eye if something falls into it.
