Question

The function of nervous tissue is
A. Irritability
B. Sensitivity
C. Responsiveness
D. Contraction

Answer 1

Hint: The nervous system provides the ability to receive stimulus and act accordingly as a response. It is a special feature exclusive to all living organisms and thus, it is one of the defining factors of the living organism.
The excitatory ability that living organisms have to respond to changes in their environment.

Complete answer: The irritability of the nervous tissue is essentially the property possessed by the neuron of the nervous system to initiate a response to an external stimulus by converting it into an electrical nerve impulse.
The neurons further carry these signals to the main controlling unit of the body i.e. the brain.
The brain relays these signals and instructs different parts of the body to function accordingly.
The term ‘irritability’ is generally used in the case of both the physiological reaction in response to stimuli, as well as the abnormal or extensive sensitivity towards external stimuli.

So, the correct answer is option A. Irritability.

Note: Irritability can be also a typical behavior found in people due to certain stressful circumstances that may cause some kind of annoyance or frustration.
Mostly it can completely be a normal and temporary symptom suggesting anxiety, but in some cases, constant irritability might be an indication of a more severe disorder.