Question
Describe reflex action.
✓
Answer
The entire process of response to a peripheral neural stimulation, that occurs involuntarily, i.e., without conscious effort or thought and requires the involvment of a part of the central neural system is called a reflex action. The reflex pathway comprises at least one afferent neuron (receptor) and one efferent effector or excitor neuron appropriately arranged in a series. The afferent neuron receives signal from a sensory organ and transmits the impulse via a dorsal nerve root into the CNS (at the level of spinal cord). The efferent nueuron then carries signals from CNS to the effector. The stimulus and response thus forms a reflex arc as shown below in the knee jerk reflex. 
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Eukaryotic cell have organelles which may bound by a double membrane. Group the various sub-cellular organelles into these categories.
Explain a glycosidic, peptide and a phosphodiester bond.
Which vascular system is found in humans? Write any three importance of this system.
Draw or write the symbols for following:
- Hermaphrodite (bisexual).
- Pistillate.
- Perianth.
- Staminate.
- Staminodes.
- Ebracteolate.
Brinjal and potato belong to the same genus Solanum, but to two different species. What defines them as seperate species?
How does the process of vernalisation vary among different food crop varities?
Compare the following: Central neural system (CNS) and Peripheral neural system (PNS)
Arya went to a bird sanctuary with her family. She saw numerous birds there and was amazed by the colourful and vibrant world of flying birds. She also saw ostriches there but they were not flying seeing this, she asked her mother who is an ornithologist) why only birds can fly, while all other animals cannot. She also asked her mother about the birds that cannot fly.Her mother explained Arya about birds and their characteristic features. Arya felt happy knowing knowledge:
- Which characteristic features of Aves.
- What are the flight adaptations of birds?
- Name few flightless birds.
- What values are shown by Arya?
Radha's father who is a diabetic patient does not avoid food items doctor has told him in diet. He also feels lazy to go for a walk. One day, his glucose level was checked by his doctor. The doctor advised him to take injections regularly, as he was not able to control his diabetes with diet and medication. He came home and while telling the things to Radha's mother, Radha (biology student) heard them and interrupted in between. She explained that, doctor has given insulin injections to control his blood glucose level. This may be discontinued, if he will take precautions in his daily routine.
- Which endocrine gland and its part is involved in the secretion of inslin?
- Why doctor preferred him to take insulin injections and what is the role of insulin in controlling level of glucose in blood?
- What precaution he should take to protect himself from such disorder?
- What are the values reflected from Radha's character as a biology student and a daughter?
Define a taxon. Give some examples of taxa at different hierarchical levels.