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You are here: Home / Class 10 / Control and coordination / Reflex action

Reflex action

Last Updated on June 6, 2020 By Mrs Shilpi Nagpal 10 Comments

Question 1 What is a reflex action?Give example?

Question 2 Why reflex actions are generally known as spinal reflexes?

Question 3 What are receptors?

Question 4 What are Effectors?

Question 5 What are connectors?

Reflex Action
A reflex action is a spontaneous ,automatic and mechanical response to stimulus or sudden action in response to something in the environment.

For Ex:Blinking of eyes, movement of diaphragm, withdrawal of hand or foot every time when a needle or hot object is touched, sneezing, hunger etc.
1)Sensory(receptors)
a)It occur in sense organs.
b)It receive stimuli by dendrites.
c)It transmit impulse towards brain and spinal cord through axons.

2)Motor(Effectors)
a)Dendrites of these neurons synapse with axon of sensory nerves.
b)They transmit impulse from brain and spinal cord to effectors(muscle or glands)

3)Relaying(connectors)
a)They occur in brain and spinal cord.
b)They link sensory and motor neurons for distant transmission of nerve impulse.

In reflex action
Fine tips(dendrites) of receptors——–>message(electric impulse)——-> sensory nerve ——->spinal cord —–>motor nerves——>effectors(muscles or glands)

The path taken by nerve impulses in a reflex action is called reflex arc.
When our hand touches a hot object, the heat is sensed by thermo receptors present in skin of hand.The receptors trigger nerve impulse in sensory neuron. It transmits message to spinal cord, which is then passed to relay neuron which in turn passes it to motor neuron. The motor neuron trasmit instruction to muscle in our arm.The arm muscle contract and pulls our hand away from object.

Reflexes which involve spinal cord are termed as spinal reflex.

Those reflexes which involve brain are called as cerebral reflexes.

For Ex:Contraction of pupil of human eye in the presence of bright light.

Filed Under: Control and coordination, Class 10 Tagged With: cerebral reflexes, connectors, effectors, motor, receptors, reflex action, reflex arc, relaying, sensory, spinal reflex

About Mrs Shilpi Nagpal

Author of this website, Mrs Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed (I. P. University) and has many years of experience in teaching. She has started this educational website with the mindset of spreading Free Education to everyone.

Reader Interactions

Comments

  1. Prince Raj says

    May 16, 2018 at 1:32 pm

    Thanks a lot

    Reply
  2. pallavi singh says

    July 25, 2018 at 8:21 pm

    well explaination

    Reply
  3. Saharsh kumar says

    August 5, 2018 at 10:29 pm

    Thanks, the article was so helpful

    Reply
  4. Karumuri Vinay says

    August 12, 2018 at 11:22 am

    Nice

    Reply
  5. rohit kharpase says

    December 2, 2018 at 7:45 am

    Nice but it to be more systematic.

    Reply
  6. Aditya Singh says

    January 2, 2019 at 11:46 pm

    Great detailed explanation

    Reply
  7. Noora says

    August 4, 2019 at 12:04 pm

    Thanks for giving me such a brilliant and amazing answers.
    Thanks a lot..

    Reply
  8. Raj says

    May 21, 2020 at 11:39 pm

    Best

    Reply
  9. Paridhi Gupta says

    June 6, 2020 at 2:02 pm

    Wonderful and easiest explained

    Reply
  10. Study guy says

    February 8, 2022 at 10:06 pm

    Thanks for the explanation

    Reply

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