Sense Organs Main Terms PDF
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This document provides information about different types of receptors and their functions, specifically relating to senses like hearing, seeing, touching, tasting, and smelling. It describes the main parts of the ear and cells responsible for taste. Information is given about sense organs and skin, including skin receptors.
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Two types of receptors according towhat information they receive: exteroceptors interoceptors Main senses: Hearing seeing touching smelling tasting 3 main parts of the ear: – External – Middle...
Two types of receptors according towhat information they receive: exteroceptors interoceptors Main senses: Hearing seeing touching smelling tasting 3 main parts of the ear: – External – Middle – Inner How impulse about sound is created: mechanoreceptors (of the inner ear) are activated by vibration and generate nerve impulses that result in hearing and equilibrium Cells that are able to sense taste: 1. Taste buds. 2. Gustatory cells 3. Blood cells. Sense of smell receptors are called olfactory receptors. They are easily faitgued. Visceral sensations are those sensations of inner body, they include hunger and thirst. Cutaneous sensations means skin senbsations. Skin acts as protective barrier, it also helps regulating body temperature, to get rid of toxins and is able to generate vitamin D. Main parts of skin: Epidermis Dermis Hypodermis Note: dermal also means „of skin“ Skin color is caused by: -melanin -carotene -hemoglobin These are skin receptors (no need to learn as good as to be able to name all of them; but you need to be able to distingusih them as cells of skin feeling pats, i.e. receptors, if you see those words): 1. Meissner’s corpuscles 2. Ruffini’s corpuscles 3. Pacinian corpuscles 4. Krause’ end bulbs 5. Muscle spindules Characteristics of senses: Projection – sensation seems to come from the area where the receptors were stimulated; in reality they are being “felt” via the cerebral cortex. Intensity – the intensity of a sensation is related to the strength of the stimulus and/or number of receptors stimulated. Contrast – effect of a previous sensation on a current sensation; brain compares a new sensation to a previous one. Adaptation – you become unaware of a continuous stimulus. After image – sensation remains in the consciousness even after the stimulus is gone – flash from a camera.
