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प्रश्न
Which of the following is not an involuntary action?
(a) vomiting
(b) chewing
(c) heart beat
(d) salivation
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उत्तर
(b) chewing
Chewing is a voluntary action, while actions like vomiting, heart beat and salivation are involuntary.
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संबंधित प्रश्न
Name the most important part of the human brain.
What are the various sense organs in our body?
What is spinal cord? What is its main function?
A person walks across a room in barefeet and puts his foot on a drawing pin lying on the floor. He lets out a cry. Explain what happens in his nervous system in bringing about this response.
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 involuntary actions in the body are controlled by :
(a) medulla in forebrain
(b)medulla in hindbrain
(c) medulla in spinal cord
(d) medulla in midbrain
The part of brain which controls the involuntary action such as heart beat, breathing, blood pressure, etc. is :
(a) pons
(b) medulla
(c) cerebrum
(d) cerebellum
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?
With the help of suitable example, describe reflex action.
Differentiate between natural reflex and conditioned reflex. Give examples to illustrate your answer.
What type of reflex is the following?
Blinking of the eye
Mention, if the following statement is True or False
Reflex action involves brain
In reflex action, the reflex arc is formed by ______
Reflex arc allows the rapid response of the body to a stimulus.
The reflex arc which is made up of one sensory and one motor neuron is ______
Why have reflex arcs evolved in animals?
Categorise the following under stimulus and response.
Withdrawal of hand on touching a hot plate
