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प्रश्न
Complete the following sentence with appropriate Word
Which of the following is not a natural reflex action?
पर्याय
Knee-jerk
Blinking of eyes due to strong light
Salivation at the sight of food
Sneezing when any irritant enters the nose
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उत्तर
Salivation at the sight of food
APPEARS IN
संबंधित प्रश्न
Which of the following is not a natural reflex action?
A. Knee-jerk
B. Blinking of eyes due to strong light
C. Salivation at the sight of food
D. Sneezing when any irritant enters the 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
When we touch a hot plate unknowingly, then this heat is sensed by a receptor P present in our fingers. The receptor triggers and impulse in neuron Q which transmits the message to an organ R which is a part of the central nervous system. Here the impulse is passed on to a neuron S which in turn passes it to a yet another neuron T. The neuron T passes the impulse to a tissue U in our arm. The tissue U then contracts and pulls our hand away from the hot plate.
(a) What is the name of (i) receptor P (ii) neuron Q, and (iii) organ R?
(b) What is (i) neuron S, and (ii) neuron T?
(c) Name the tissue U.
(d) What name is given to the phenomenon in which hand is pulled away quickly from the hot plate?
(e) Name the effector in this whole process.
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?
State whether the following is simple reflex, conditioned reflex or neither of the two:
Lifting up a book: …………………..
Explain the mechanism of reflex action with the help of a suitable diagram.
List in tabular form two differences between reflex action and walking.
State whether the following is simple reflex, conditioned reflex or neither of the two.
Blushing
What type of reflex is the following?
Sweating in summer
Which sensory organ is involved in vertigo (sensation of oneself or objects spinning around)?
