OCEANO 1 Lecture Notes - Lecture 2: Taste Bud, Ghrelin, Vagus Nerve
Document Summary
The basic tastes taste: detection of environmental chemicals smell: detection of environmental chemicals chemically sensitive cells. Odors from the food can pass via the pharynx into the nasal cavity where they can be detected by olfactory receptors. Threshold concentration of basic taste stimuli: has to be reached to evoke perception of taste. Papillae are sensitive to only one basic taste: higher concentration above threshold= Papillae are less sensitive, respond to different tastes. Each papilla has a few hundred taste buds. Each taste bud has 50 150 papillae. The process that maintains the internal environment of the body within a narrow physiological range. Plays a key role in regulation of body temperature, fluid balance, energy balance. Example: you are cold, hydrated, depleted of energy: humoral response. Hypothalamic neurons respond to sensory signals by stimulating or inhibiting the release of pituitary hormones into the bloodstream. Blood is shunted away from body surface, body fat reserves are mobilized: visceromotor response.
