A dog is following the scent of a jackrabbit. Which of the following accurately describes how the dog’s brain integrates information for smell?

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The gas molecules responsible for the scent will be recognized by cell receptors. The signal is sent to the brain through neurons which use electrochemical impluses.

Hormones are useful for sending messages long distances, but it is a slow process. The main senses (sight, touch, smell, etc.) are typically detected quickly and must use a faster form of communication.

Receptors should originate in the nose. The signals would not be sent to the motor regions of the brain, which coordinates movement.