12. Assertion: All cells possess the ability to respond to stimuli. However, cells of the nervous tissue
are highly specialised for being stimulated and then transmitting and then transmitting the
stimulus very rapidly from one place to another within the body.
Reason: The brain, spinal cord and nerves are all composed of the nervous tissue. The cells of
this tissue are called nerve cells or neurons
a) A
b) B
c) C
d) D
Answers
Answer:
a) A both assertion and correct answer...
b) Both assertion and reason are correct and the reason is not the correct explanation of assertion.
It is true that all cells of our body are capable of producing responses to stimuli. This capability, in fact, is one of the defining features of living beings. Each cell responds to its surroundings by exchanging materials with the environment.
The nervous tissue, a piece of highly complex and specialized machinery, is capable of not only responding to stimuli but also transmitting the stimulus from one place to another in a very short time. The nervous tissue forms the nerves, spinal cord, brain of our body's nervous system. It is composed of cells called the neurons which are its basic unit. The neurons are arranged in a complex manner to form the brain and spinal cord.