The molecules of our essential oils are readily absorbed into the bloodstream when they are inhaled as the lungs work to oxygenate the blood. The aroma sends a signal directly to the Limbic System in the brain, which is the centre of emotions, memory and sexual arousal. This is why essential oils have such a powerful effect on our moods and general state of mind! Nose —> Smell center —> Emotional center —> Short term memory —> Long term memory —> Master gland —> Endocrine system. The skin absorbs the essential oil particles and they are carried throughout the body. Our bodies are intelligent enough to transport the particular essential oils to the places they are most needed for healing.