Reflex action is an immediate involuntary response to a stimulus.

During reflex action, sensory impulses are converted into motor impulses in the spinal cord.

Pavlov's experiment proved conditioned reflexes on dogs.

Proprioceptors are found in muscle tendons and joints. These sense the movements and positions of muscles and appendages relative to each other and also to the spatial body as a whole.

Stimulus are received by receptors which passes it to sensory neuron that conveys impulses to spinal cord. Impulses are passed to motor neurons via inter-neurons and then, to the effector organ that responds to the impulses received.

The end organs of Ruffini act as receptors of warmth.

Merkel nerve endings are mechanoreceptors that are found in the basal epidermis and hair follicles.

Nociceptors sense deep pain responding to any injury.

Meissner's corpuscles are a type of nerve endings in the skin that are responsible for sensitivity to light touch.

Papillae are the elevated tissues on the tongue which bear taste buds.

Receptors for the bitter taste are located at the rear side of the tongue.

Statoreceptors are sense organs for the reception of stimuli governing equilibration and orientation in space.

Tactile receptors are maximum on body as it has more surface area.

Olfactory lobes perceive the sense of smell.

Receptors for sweet taste are located at the tip of the tongue.