Reflex action, Biology

Assignment Help:

REFLEX ACTION -

  • Marshel Hall discovered reflex action. Best & Taylor defined it. Reflex action is functional unit of CNS.
  • It is sudden, immediate involuntary action against external stimuli. In man it is poly-synaptic.
  • If we prick needle on skin, somatic sensory nerves bring impulses to grey matter. Here these are analysed & order is given to muscle by motor nerve.
  • The path from which impulse is passed is reflex arch.
  • Minimum time is consumed in it. It is not under control of brain.

Some common reflex actions are -

1. Coughing

2. Yawning

3. Sneezing

4. Knee-jerk reflex

5. Bleenking of eyes

6. Scratch reflex

EXAMPLE -

1.       Cycling.

2.       Watering of mouth.

3.       Blinking of eyes in sharp light.

4.       Withdrawal of leg in pithed frog.

5.       Flow of bile from gall bladder.

6.       Peristalasis.

7.       Heart beat.

2243_reflex action.png

SIGNIFICANCE -

1. It enables animal to respond immediately to the harmful stimuli so that no harm is caused to it.

2. It gives more time to brain to work.


Related Discussions:- Reflex action

Define percentages of body fat values for athletes, Define Percentages of b...

Define Percentages of body fat values for athletes? Percentages of body fat values for athletes vary depending on the sex of the athlete and the sport itself. Male athletes par

Define glycogen , A glycogen molecule having entirely of glucose uni...

A glycogen molecule having entirely of glucose units, many of that are linked in long chains through α1-4 bonds.  Furthermore,  every  10  units  or  so,  the  chain  is branched

Determine food sources of ascorbic acid (vitamin c), Determine Food Sources...

Determine Food Sources of ascorbic acid (vitamin c)? Food sources of vitamin C include: Rich sources: Amla and guava. Good sources: Drumstick leaves, other leafy ve

What is metabolomics, Together, genomics, proteomics and transcriptomics ar...

Together, genomics, proteomics and transcriptomics are influential approaches to enhancing our understanding not only of how cells function normally but also what the key modificat

Life, How life exist in earth?

How life exist in earth?

Are the alleles of a gene essentially originated, Are the alleles of a gene...

Are the alleles of a gene essentially originated one from the father and the other from the mother? Are there exceptions? It is natural so that alleles have come one from the m

Define estimation of blood thiamin levels - thiamin status, Define Estimati...

Define Estimation of Blood Thiamin Levels - Thiamin Status? The levels of free thiamin and its phosphoesters in whole blood and erythrocytes are measured using high- performanc

Transcription of protein-coding genes in eukaryotes, The Protein synthesis ...

The Protein synthesis is very significant because it is by the use of genetic information to synthesize proteins in which the genes in the DNA are expressed in the phenotype. Make

Explain about common congenital heart diseases, Explain about common congen...

Explain about common congenital heart diseases ? Congenital Heart Disease is commonly classified as acyanotic and cyanotic. Acyanotic Left to right shunts Obstructive Lesion

What is crystallization of a virus, What is crystallization of a virus? Wha...

What is crystallization of a virus? What is the importance of this process? Crystallization is the method of transformation of viral components into organized solid particles.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd