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प्रश्न
Explain the difference between of the following pair of terms :
receptor and effector
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उत्तर
| Receptor | Effector |
| A receptor is a cell (or a group of cells) present in a sense organ which is sensitive to a particular types of stimuli such as light, sound, smell, taste, heat and pressure. | An effector is a part of the body which can respond to a stimulus according to the instructions sent from the nervous system. |
| Eyes have light receptors; ears have sound receptors, etc. | Muscles and glands are examples of effectors. |
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संबंधित प्रश्न
Give examples of unconditional reflexes
Give the various functions of brain.
Cerbellum, medulla and pons are the parts of :
(a) mid-brain
(b) hind-brain
(c) forebrain
(d) spinal cord
Which of the following are cerebral reflexes?
(i) a person pulls away his hand on touching a hot object
(ii) a person spits out immediately when a fly enters his mouth while talking
(iii) A person walking bare foot lifts his foot at once on stepping on to a nail
(iv) A person's pupil contracts at once in the presence of bright light
(a) (i) and (ii) (b) (ii) and (iii) (c) (iii) and (iv) (d) (ii) and (iv)
The olfactory receptors in humans are located in :
(a) eyes
(b) tongue
(c) ears
(d) nose
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
P is a cell (or group of cells) in the human body which is sensitive to a particular type of stimulus and conveys the messages to CNS through nerves Q. On the other hand, R is a part of the human body which can respond to a stimulus according to the instructions sent from the CNS through nerves S.
(a) What is P? Name five organs which contain cells (or group of cells) like P.
(b) Name the nerves Q.
(c) What is R? Give two examples of R.
(d) Name nerves S.
(e) How do messages travel through the nerves Q and S?
Differentiate between the following pair of terms:
Stimulus and impulse
what do we refer to in the nervous system when we say:
Natural and conditioned …………………
Two hungry boys (A and B) enter a restaurant and find a table decorated as follows:
Boy B starts salivating but not A. Explain the reason for this difference.
Give one example of a conditioned reflex in your own life.
State whether the following is simple reflex, conditioned reflex or neither of the two.
Lifting up a book
Give Reason:
The hand automatically shows the direction to turn a cycle without thinking.
Give Technical Term:
Response to a stimulus without the intervention of the will of an animal.
Mention, if the following statement is True or False
Reflex action involves brain
In reflex action, the reflex arc is formed by ______
A change in the environment that causes an animal to react is called ______.
Which of the following is not involved in Knee-jerk reflex?
What kind of reflex is cycling?
