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Question
Complete the following sentence with appropriate Word
Which of the following is not a natural reflex action?
Options
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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Solution
Salivation at the sight of food
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Fill in the following blanks with suitable words :
Our.............system allows us to react to our surroundings. Information from receptors passes along...........neurons to our brain. Our brain sends impulses along..........neurons to our muscles.
What is the difference between a voluntary and an involuntary action? Which kind of action is digestion? Explain your choice.
The part of brain which takes part in regulating respiration in the human body is :
(a) medulla
(b) pons
(c) cerebellum
(d) cerebrum
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?
Differentiate between the following pair of terms:
Stimulus and impulse
State whether the following is simple reflex, conditioned reflex or neither of the two:
Blushing: ……………….
State whether the following is simple reflex, conditioned reflex or neither of the two:
Knitting without looking: …………………..
Explain the mechanism of reflex action with the help of a suitable diagram.
Mention, if the following statement is True or False
Reflex action is a unit of nervous action
