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

What is deuterostome. explain in brief., What is Deuterostome. Explain in b...

What is Deuterostome. Explain in brief. Phyla, including the Chordata and Echinodermata which share common characteristics of blastopore-not forming the mouth, radial indetermi

Explain the psychological management of eating disorders, Explain the Psych...

Explain the Psychological Management of eating disorders? All anorexia nervosa or bulimia nervosa patients are resistant to any kind of therapy and hospitalization may be a lif

How can i become involved in supporting brain research, How can I become in...

How can I become involved in supporting brain research? A. Here are some ways which you can support brain research: Join in activities of Brain Awareness Week. Dona

Describe the various steps involved in glycolysis, Question 1 Give a detai...

Question 1 Give a detailed account on "high energy compounds" Question 2 Describe the various steps involved in Glycolysis Question 3 Give a detailed account on Oxidativ

Antioxidants and flavanoids requirement in dyslipidemia, Q. Antioxidants an...

Q. Antioxidants and Flavanoids requirement in dyslipidemia? Antioxidants and Flavanoids: You must have already read about different antioxidants present in our foods. The body

Explain the storage of vitamin e, Explain the Storage of Vitamin E? Vi...

Explain the Storage of Vitamin E? Vitamin E is mainly stored in muscles and adipose tissue. Vitamin E content of erythrocytes is about 20 percent of that in plasma and there i

Tracheal gills - respiration, Tracheal Gills - Respiration In many spe...

Tracheal Gills - Respiration In many species of aquatic insects the air in the trachae is replenished by diffusion of oxygen via tracheal gills. Many aquatic insects carry a t

Almost bacteria are anaerobic, Most bacteria are anaerobic. If a bacterium ...

Most bacteria are anaerobic. If a bacterium were to produce the same amount of ATP within a minute as a cell extracted from your skeletal muscle, what would that bacterium have to

How calcium prevents luxury consumption of potassium, How calcium prevents ...

How calcium prevents luxury consumption of potassium Increasing Ca:K ratio in soil solution depresses the uptake of potassium. Thus one of the harmful effects of over liming m

Asymptomatic patient-chronic mitral regurgitation, Asymptomatic patient: ...

Asymptomatic patient: The current opinion is that in asymptomatic patients with left ventricular dysfunction and severe MR surgery should not be delayed. The echo cardiographic a

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