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प्रश्न
Define reflex arc. Give the flow chart of a spinal reflex arc.
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उत्तर
The path travelled by an impulse during a reflex action is called a reflex arc.
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संबंधित प्रश्न
State one function each of cerebellum and pons.
Fill in the following blank with suitable word :
A neuron which carries an impulse to the brain is called a ........... neuron.
When you smell a favourite food your mouth begins to water (that is, you secrete saliva). Write down what is the example of the smell of the food?
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)
All the voluntary actions of our body are controlled by :
(a) cerebrum
(b) cerebellum
(c) pons
(d) medulla
One of the following gives the correct sequence of the components in a reflex arc. This is:
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?
State whether the following is
Constriction of pupil
State whether the following is simple reflex, conditioned reflex or neither of the two.
Knitting without looking
State whether the following is
Playing on the Keyboard
What type of reflex is the following?
Knitting and swimming
What type of reflex is the following?
Blinking of the eye
Complete the following sentence with appropriate Word
Which of the following is not a natural reflex action?
What will you do if someone pricks your hand with a needle? Elucidate the pathway of response with a neat labelled diagram.
Which sensory organ is involved in vertigo (sensation of oneself or objects spinning around)?
How is the mode of action in beating of the heart different from reflex actions? Give four examples.
State whether the following is simple reflex, conditioned reflex or neither of the two.
Sneezing
The diagram given below shows the internal structure of a spinal cord depicting a phenomenon. Study the diagram and answer the following questions.
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- Name the phenomenon shown in the figure and define the same.
- Identify the parts labelled as 1 and 2. Write one functional difference between these two.
- Name the bony protective covering and the membranous protective covering of the spinal cord.
- Label the guidelines 3 and 4.
- How is the labelled part 3 different from part 4 with respect to its composition (part of neuron)?
- Give the technical term for the point of contact between the two nerve cells.
- Name the fluid filled inside the central canal of spinal cord.
- Name the term used for a small gap between two neurons.
- Give one example of a neurotransmitter.
- Draw a neat diagram of a nerve cell and label the parts: Perikaryon, Node of Ranvier, Myelin sheath and Axon terminals.
