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प्रश्न
Long answer question
Explain the Reflex Pathway with the help of a neat labelled diagram.
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उत्तर
i. The reflex pathway comprises at least one afferent neuron (receptor) and one efferent (effector or excitor) neuron appropriately arranged in a series.
ii. The afferent neuron receives a signal from a sensory organ and transmits the impulse via a dorsal nerve root into the CNS (at the level of the spinal cord).
iii. The efferent neuron then carries signals from CNS to the effector. The stimulus and response thus form a reflex arc as shown below in the knee jerk reflex.
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संबंधित प्रश्न
Name the following:
Five sense organs of human beings and the sensation perceived by each one.
Draw a labelled diagram of eye.
With the help of a suitable diagram describe the structure of a neuron.
Answer the following question:
What is a reflex action? Explain it with two examples.
Plants do not have any nervous system but yet, if we touch a sensitive plant, some observable changes take place in its leaves. Explain how could this plant respond to the external stimuli and how it is communicated.
Explain the Term: Synapse
Mention, if the following statement is True or False
A nerve impulse passes from one neuron to another across a synapse.
Define stimulus.
Identify the sensory cranial nerves ____________.
Complete the following table:
| No. | Name of Nerve | Type of Nerve | Function |
| 1. | Optic | ||
| 2. | Facial | ||
| 3. | Hypoglossal | ||
| 4. | Trigeminal | ||
| 5. | Auditory | ||
| 6. | Glossopharyngeal |
