What will you do if someone pricks your hand with a needle? Elucidate the pathway of response with a neat labelled diagram. Enable Ginger Cannot connect to Ginger Check your internet connection or reload the browser Disable in this text field Edit Edit in Ginger Edit in Ginger ×

If someone pricks our hand with a needle, we immediately withdraw our hand. Here the skin is the receptor and it receives the stimulus, that is the pain. This stimulus in turn triggers an impulse in a sensory neuron. The sensory neuron transmits the message to the spinal cord. The spinal cord interprets the stimulus and the impulse is passed on to the relay neuron which in turn transmits it to a motor neuron. The motor neuron carries command from the spinal cord to our arm. The muscle in our arm contracts, and we withdraw our hand immediately.

Classify neurons based on its structure. Enable Ginger Cannot connect to Ginger Check your internet connection or reload the browser Disable in this text field Edit Edit in Ginger Edit in Ginger ×

Based on structure, the neurons are classified as the following types- i) Unipolar neurons- In this only one nerve process arises from the cyton. It acts as both axon and dendron. These are found in early embryos but not in adults. ii) Bipolar neurons- In this, the cyton gives rise to two nerve processes. One acts as an axon while another as a dendron. These are found in the retina of the eye and olfactory epithelium of nasal chambers. iii) Multipolar neurons- Here the cyton gives rise to many dendrons and an axon. These are found in the cerebral cortex of the brain.

E M B I B E

Science Standard 10>Chapter 15 - Nervous System>TEXTBOOK EVALUATION>Q 1

EASY

10th Tamil Nadu Board

IMPORTANT

Earn 100

With a neat labelled diagram explain the structure of a neuron.

Important Questions on Nervous System

HARD

10th Tamil Nadu Board

IMPORTANT

Science Standard 10>Chapter 15 - Nervous System>TEXTBOOK EVALUATION>Q 2

Illustrate the structure and functions of brain.

HARD

10th Tamil Nadu Board

IMPORTANT

Science Standard 10>Chapter 15 - Nervous System>TEXTBOOK EVALUATION>Q 3

What will you do if someone pricks your hand with a needle? Elucidate the pathway of response with a neat labelled diagram.

HARD

10th Tamil Nadu Board

IMPORTANT

Science Standard 10>Chapter 15 - Nervous System>TEXTBOOK EVALUATION>Q 4

Describe the structure of spinal cord.

HARD

10th Tamil Nadu Board

IMPORTANT

Science Standard 10>Chapter 15 - Nervous System>TEXTBOOK EVALUATION>Q 5

How nerve impulses are transferred from one neuron to next neuron?

MEDIUM

10th Tamil Nadu Board

IMPORTANT

Science Standard 10>Chapter 15 - Nervous System>TEXTBOOK EVALUATION>Q 6

Classify neurons based on its structure.

EASY

10th Tamil Nadu Board

IMPORTANT

Science Standard 10>Chapter 15 - Nervous System>TEXTBOOK EVALUATION>Q 1

'A' is a cylindrical structure that begins from the lower end of medulla and extend downwards. It is enclosed in bony cage 'B' and covered by members 'C'. As many as 'D' pairs of nerves arise from the structure 'A'.

(i) What is 'A'?
(ii) Name (a) bony cage 'B' and (b) membranes 'C'.
(iii) How much is D?

EASY

10th Tamil Nadu Board

IMPORTANT

Science Standard 10>Chapter 15 - Nervous System>TEXTBOOK EVALUATION>Q 2

Our body contains a large number of cells 'L' which are the longest cells in the body. L has a long and short branch called 'M' and 'N' respectively. There is a gap 'O' between two 'L' cells, through which nerve impulse transfer by the release of chemical substance 'P'.

(i) Name the cells L.
(ii) What are M and N?
(iii) What is the gap O?
(iv) Name the chemical substance P.