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प्रश्न
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?
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उत्तर
(a) P is a receptor. The five organs which contain receptors are: eyes, ears, nose, tongue and skin.
(b) Q represents sensory nerves. Sensory nerves bring impulses from sensory organs to the CNS.
(c) R is an effector organ. Effectors are part of the human body which can respond to a stimulus according to the instructions sent from the CNS though the motor nerves. Two examples of effector organs are the muscles and glands.
(d) S represents motor nerves. Motor nerves carry impulse from the CNS to the effector organs like the muscles or glands.
(e) Messages travel in the form of electrical impulses or nerve impulses through sensory nerves (Q) and motor nerves (S).
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संबंधित प्रश्न
Which part of the eye contains cells which are sensitive to light?
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.
Write the names of the regions in hindbrain. Give one function of each region.
Name the function of cerebrum.
Explain the difference between of the following pair of terms :
receptor and effector
What is a reflex action? Explain with the help of an example.
A cell (or group of cells) in a sense organ which is sensitive to a particular type of stimulus is called :
(a) interceptor
(b) effector
(c) receptor
(d) acceptor
With the help of suitable example, describe reflex action.
Explain the mechanism of reflex action with the help of a suitable diagram.
List in tabular form three distinguishing features between cerebrum and cerebellum.
State whether the following is simple reflex, conditioned reflex or neither of the two.
Knitting without looking
What type of reflex is the following?
Formation of goose-pimples in cold weather.
Give Technical Term:
The scientist, who conducted experiment on a dog to show conditioned reflex
Mention, if the following statement is True or False
Reflex action involves brain
Give an example for conditioned reflexes.
Which one of the following is not a simple reflex?
Which sensory organ is involved in vertigo (sensation of oneself or objects spinning around)?
State whether the following is simple reflex, conditioned reflex or neither of the two.
Sneezing
