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Standard XII
Biology
Question

The following is the scheme showing the path of reflex arc. Identify the different labeling A, B, C, D, E, F in the reflex arc.
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  1. A- Stimulus, B- Effector, C- Motor nerve, D- Sensory nerve, E- Receptor, F- Response
  2. A- Stimulus, B- Receptor, C- Motor nerve, D- Sensory nerve, E- Effector, F- Response
  3. A- Stimulus, B- Effector, C- Sensory nerve, D- Motor nerve, E- Receptor, F- Response
  4. A- Stimulus, B- Receptor, C- Sensory nerve, D- Motor nerve, E- Effector, F- Response

A
A- Stimulus, B- Receptor, C- Sensory nerve, D- Motor nerve, E- Effector, F- Response
B
A- Stimulus, B- Effector, C- Motor nerve, D- Sensory nerve, E- Receptor, F- Response
C
A- Stimulus, B- Effector, C- Sensory nerve, D- Motor nerve, E- Receptor, F- Response
D
A- Stimulus, B- Receptor, C- Motor nerve, D- Sensory nerve, E- Effector, F- Response
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Solution
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The patellar reflex or knee-jerk is a deep tendon reflex and is a monosynaptic reflex.
When the patellar tendon is tapped just below the knee, the patellar reflex is initiated and the lower leg kicks forward (via contraction of the quadriceps).
The tap initiates an action potential in a specialized structure known as a muscle spindle located within the quadriceps. This action potential travels to the spinal cord, via a sensory axon, which chemically communicates by releasing glutamate onto a motor nerve.
The result of this motor nerve activity is a contraction of the quadriceps muscle, leading to an extension of the lower leg at the knee.

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Similar Questions
Q1

Note the relationship between the first two words and suggest the suitable word/words for the fourth place.

(a) Stimulus : Receptor :: Impulse : ..............

(b) Cerebrum : Diencephalon :: Cerebellum : ................

(c) Receptor : Sensory nerve :: Motor nerve :...............

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Q2
Note the relationship between the first two words and suggest the suitable word/words for the fourth place.
(a) Stimulus : Receptor :: Impulse: __________
(b) Cerebrum : Diencephalon :: Cerebellum: __________
(c) Receptor : Sensory nerve :: Motor nerve: __________
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Q3
Rearrange the following in the correct sequence pertaining to what is given within brackets at the end.
(a) Effector Sensory neuron Receptor Motor neuron Stimulus Central nervous system Response (Reflex arc)
(b) Repolarisation Depolarisation Resting (polarised) (during conduction of nerve impulse through a nerve fibre)
(c) Axon endings Nucleus Dendrites Axon Perikaryon Dendron (Neuron structure)
(d) Diencephalon Cerebellum Medulla oblongata Pons Cerebrum mid brain (sequence of parts of human brain).
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Q4
Which of the following statements are true?
(i) Sudden reaction in response to the stimulus is called reflex action.
(ii) Sensory neurons carry signals from the spinal cord to muscles.
(iii) Motor neurons carry signals from receptors to spinal cord.
(iv) Reflex arc is the process in which the nerve impulse is carried and the response is generated.
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Q5

Identify the incorrect statement(s).

I. The nerves carrying impulses from CNS to the peripheral system are Sensory nerves or Afferent nerves

II. The nerves carrying impulses from the peripheral system to CNS are Motor nerves or Efferent nerves

III. Sensory system coordinates auditory, visual, touch receptors etc.

IV. Motor system coordinates impulses towards effector organs.


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