MUSCLE PHYSIOLOGY

Detailed explanation-1: -The stimuli for smell are volatile chemical substances suspended in the air. These molecules stimulate the olfactory receptors, which are in the upper portions of the nasal passages. Neurons from these receptors bundle together to form the olfactory nerve, which travels to the olfactory bulb at the base of the brain.

Detailed explanation-2: -The stimuli for smell are chemical molecules that enter the nose, so smell is considered a chemical sense. It is also referred to as the olfactory system, and the olfactory epithelium is where stimuli are detected.

Detailed explanation-3: -Taste (gustation) and smell (olfaction) are called chemical senses because both have sensory receptors that respond to molecules in the food we eat or in the air we breathe. There is a pronounced interaction between our chemical senses.

Detailed explanation-4: -Chapter 15The Chemical Senses Three sensory systems associated with the nose and mouth-olfaction, taste, and the trigeminal chemosensory system-are dedicated to the detection of chemicals in the environment. The olfactory system detects airborne molecules called odors.

Detailed explanation-5: -Whenever a detectable molecule, or odorant, attaches to an olfactory receptor, it generates a tiny electrical impulse. As these currents enter the complex network of the brain, it can quickly (sometimes within just two or three synapses, in a tenth of a second) recognize the odor.