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

Can you explain toxicants in plant foods, Q. Can you explain Toxicants in P...

Q. Can you explain Toxicants in Plant Foods? Several foods, some of which we consume regularly, have toxic compounds in them which are best avoided. These compounds can be prot

Respiration, what chemical is normally used to test for the presence of car...

what chemical is normally used to test for the presence of carbon dioxide

Weaning the infant from the incubator, Weaning the Infant from the Incuba...

Weaning the Infant from the Incubator When heater output reading is minimal or nil it suggest that infant is capable of generating enough metabolic heat to keep himself war

Advantages and disadvantages of organizational charts, Advantages and Disad...

Advantages and Disadvantages: of Organizational Charts Advantages  a)  Defining the Organizational Relationship Without a,chart, many people might view the organization as

Rheumatic fever and rheumatic heart diseases, Rheumatic Fever and Rheumatic...

Rheumatic Fever and Rheumatic Heart Diseases Rheumatic fever is an inflammatory disease of the heart potentially involving all layers of the heart. The resulting damage to t

Probation/parole client , Write a report on a special probation/parole clie...

Write a report on a special probation/parole client and programs that have been situated to address this problem client. Focus on 1type of special requires offender (substance abus

What do you mean by pericardial effusion, Q. What do you mean by Pericardia...

Q. What do you mean by Pericardial effusion? Collection of fluid in the pericardial sac is known as Pericardial effusion. All cases of pericarditis can lead to pericardial effu

Define the structure of d and l isomerism, Define the Structure of D and L ...

Define the Structure of D and L isomerism? The prefix D or L are used to refer to the configuration of the carbon next to the primary alcoholic group or in other words, the con

Phylum, Are protozoan''s diploblastic or triploblastic

Are protozoan''s diploblastic or triploblastic

Describe intemittent mandatory ventilation, Describe Intemittent Mandatory ...

Describe Intemittent Mandatory Ventilation (IMV) Mandatory breaths are delivered at set tidal volumes and rates, and the patient can breathe on his own in between through a un

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