Question

Which of the following recieves an external stimulus and generates an impulse in response?

• A. Receptors
• B. Effector
• C. Hormones
• D. Spinal cord

Answer 1

The correct option is A

Receptors

Receptors are specialised molecules that detects the external stimuli (changes in the environment). They transfer the message in the form of an impulse to the brain via sensory neurons and interneuron. An effector converts the impulse into a response.