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The Nervous System Vertebrates have a spinal column or backbone. Vertebrates have neurons that are outside that spinal column called Peripheral Neurons and neurons inside the spinal column and head called Central Neurons. i) Peripheral Neurons ® a) Efferent Nerves (motor nerves) send signals from central nerves to effector organs; b) Afferent Nerves (sensory nerves) send signals from sensory receptor to the central nervous system. ii) Central Nervous System (CNS) is made up of your brain a…

…liquid (or mucus) because the chemical being sensed must be in a solution. Olfactory cells are special receptors in the nose, which detect chemicals in the air. 2) Taste: These receptors are on the tongue. They detect only five different chemicals causing taste, they are: bitter, sweet, salty, bitter and picante. Taste receptors are called taste buds. Flavors are a combination of both tasting and smelling at the same time. Bibliography Have fun