Question

Fill in the blanks. Choose the appropriate word or words from the brackets and fill up the blanks:

(c)An _____ is a change in the environment that may be of sufficient strength to initiate an impulse.(effector/stimulus)

Answer 1

Stimulus:

1. Any change in the environment that provokes a suitable response from an organism is called a stimulus
2. Effectors respond to a stimulus only when they have received the message from the brain in the form of an impulse.
3. A stimulus should be strong enough to evoke a response from the organism.
4. Stimuli are transmitted through the sensory receptors to the central nervous system.

Final Answer: An stimulus is a change in the environment that may be of sufficient strength to irritate an impulse