English

Define the following: Reflex action

Advertisements
Advertisements

Questions

Define the following:

Reflex action

Define the following term:

Reflex action

Define reflex action.

Definition
Advertisements

Solution

Reflex action is an automatic/quick/immediate, involuntary action in the body brought about by a stimulus. This mechanism prevents injury to the body by triggering a rapid and automatic response.

shaalaa.com
  Is there an error in this question or solution?
Chapter 10: Nervous System - EXERCISE [Page 173]

APPEARS IN

Lakhmir Singh Biology [English] Class 10 ICSE
Chapter 10 Nervous System
EXERCISE | Q 2. 1. | Page 173
Frank Biology Part 2 [English] Class 10 ICSE
Chapter 10 Nervous System
Exercises | Q 9. (e) | Page 149
Selina Concise Biology [English] Class 10 ICSE
Chapter 10 The Nervous System
Review Questions | Q D. 1. (e) | Page 145

RELATED QUESTIONS

Which part of the brain maintains posture and equilibrium of the body?


Which of the following is not a natural reflex action?

A. Knee-jerk

B. Blinking of eyes due to strong light

C. Salivation at the sight of food

D. Sneezing when any irritant enters the nose


Our ______ system allows us to react to our surroundings. Information from receptors passes along ______ neurons to our brain. Our brain sends impulses along ______ neurons to our muscles.


The olfactory receptors in humans are located in :
(a) eyes
(b) tongue
(c) ears
(d) nose


what do we refer to in the nervous system when we say:

Natural and conditioned …………………


List in tabular form three distinguishing features between cerebrum and cerebellum.


A change in the environment that causes an animal to react is called ______.


Categorise the following under stimulus and response.

Withdrawal of hand on touching a hot plate


State whether the following is simple reflex, conditioned reflex or neither of the two.

Sneezing


The diagram given below shows the internal structure of a spinal cord depicting a phenomenon. Study the diagram and answer the following questions.

  1. Name the phenomenon shown in the figure and define the same.
  2. Identify the parts labelled as 1 and 2. Write one functional difference between these two.
  3. Name the bony protective covering and the membranous protective covering of the spinal cord.
  4. Label the guidelines 3 and 4.
  5. How is the labelled part 3 different from part 4 with respect to its composition (part of neuron)?
  6. Give the technical term for the point of contact between the two nerve cells.
  7. Name the fluid filled inside the central canal of spinal cord.
  8. Name the term used for a small gap between two neurons.
  9. Give one example of a neurotransmitter.
  10. Draw a neat diagram of a nerve cell and label the parts: Perikaryon, Node of Ranvier, Myelin sheath and Axon terminals.

Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×