Organs sensory systems

Identify strategies to improve nutritional, processing and sensory quality and safety characteristics in organic farming systems ... 

As with many macrosmatic mammals, rodents have two separate chemosensory systems, the main olfactory system (MOS) and accessory olfactory system (AOS), which respond to social odors. Importantly, these sensory systems differ not only in their peripheral morphology and central projections, but also in the types of chemosignals that they process (Meredith 1991). Sensory neurons of the MOS, which are located in the main olfactory epithelium and project to the main olfactory bulbs, process volatile chemicals and can detect odors at a distance. In contrast, sensory neurons of the AOS, which are located in the vomeronasal organs (VNO) and project to the accessory olfactory bulbs, primarily process large, non-volatile chemicals and require contact for stimulation (Meredith 1991). 

Another method employed rather frequently by neuropharmacologists involves measurement of transmission in sensory systems by the so-called evoked potential technique. A sense organ, e.g. the eye or the ear, is stimulated by a light flash or a loudspeaker click, and an afferent volley of nerve impulses is produced. This volley travels first through peripheral sensory nerve fibers and then through the afferent systems in the CNS to reach finally the so-called projection area of the cerebral cortex. 

Capsicum, also known as chili or paprika, is the fruit of various Capsicum species. It is widely used as a spice and, traditionally, it has been used internally for colic, flatulent dyspepsia, chronic laryngitis, insufficiency of peripheral circulation, and externally for neuralgia. Capsaicin (the active pungent ingredient) has been used extensively as a probe to elucidate the function of sensory neurons in various organs and systems (including the stomach), because of its ability to excite and later defunctionalize a subset of primary afferent neurons. 

Vertebrates possess three primary chemosensory systems gustation ( taste ), trigeminal, and olfaction ( smell ) but only one of these, the olfactory system, mediates responses to pheromones. Chemicals that stimulate the olfactory system are known as odorants and comprise one type of biological cue (any entity that stimulates a sensory system). Bouquets of odorants that can be discriminated as specific entities are termed odors. The olfactory system contains olfactory receptor neurons (ORNs) that comprise cranial nerve I and project directly to the forebrain. ORNs are now known to express only one to a few olfactory receptor proteins ( receptors ), which means that the chemoreceptive range of each neuron can be very narrow. The olfactory system also has several subcomponents including the vomeronasal organ, which is described below. 

Observational studies Comparative studies Drug-combination studies Placebo-controlled studies Systematic reviews Organs and systems Cardiovascular Respiratory Ear, nose, throat Nervous system Neuromuscular function Sensory systems Psychological Psychiatric Endocrine Metabolism Nutrition... 

Like taste, touch is a combination of sensory systems that are expressed in a common organ—in this case, the skin. The detection of pressure and the detection of temperature are two key components. Amiloride-sensitive sodium channels, homologous to those of taste, appear to play a role. Other systems are responsible for detecting painful stimuli such as high temperature, acid, or certain specific chemicals. Although our understanding of this sensory system is not as advanced as that of the other sensory systems, recent work has revealed a fascinating relation between pain and taste sensation, a relation well known to anyone who has eaten "spicy" food. 

Human perception is the active reception and coordination of information received through our sensory systems in order to make sense of the environment and to behave effectively within it. In contrast with the direct and immediate sensations actually received and transmitted, perception is the transformation of that information into nerve cell activity that is transferred to the brain where further processing occurs. Our perceptual systems do not passively receive stimuli from the world, instead they actively select, organize, interpret, and sometimes distort sensory information. The real world then may not be the same as the one we perceive. Broadly, perception can be said to be the study of the human organism s relation to the physical world. 

Abstract Sensors are crucial components in homeostatic control systems. Amino acids (AAs) are the building blocks of protein all 20 standard AAs that are used in protein synthesis must be available simultaneously for an organism to maintain homeostasis and survive. Therefore, a sensory system for AAs is essential for protein synthesis and survival. In living organisms, biochemical and behavioral observations demonstrate AA sensing. 

The fourth section focuses on individual and sub-individual effects and responses. The first chapter within this section (Chapter 9) reviews the effects of UVR on DNA, which has long been identified as one of the primary targets of UVR in biological systems. It is followed by a discussion of the main physiological photoprotective mechanisms in aquatic organisms (Chapter 10), Chapter 11 reviews the available literature on UVR effects on autotrophs, while Chapters 12 and 13 present two different and complementary perspectives on the effects of UVR on heterotrophs. This section ends with an extensive review on the role of sensory systems and behavioral responses to UVR (Chapter 14). 

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