BIO 126 Lecture 7: Neuroscience III - Sensory Systems Ch 43 copy
21 Mar 2016
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Sensory transduction: incoming stimuli are converted into neural signals. From an animal"s body or the external environment. Perception: awareness of sensations, not all sensations are consciously perceived. Sensory receptor: recognizes stimulus and initiates signal transduction, creates graded potentials, when the response is strong enough, an action potential is sent to the. Modality or type of receptor: chemoreceptor respond to specific chemicals, thermoreceptor respond to cold and heat, mechanoreceptor transduce mechanical energy, electromagnetic receptors detect radiation within a wide range of the electromagnetic spectrum. Photoreceptor respond to visible light energy: nociceptors pain receptors respond to extreme heat, cold, and pressure, as well as to certain molecules such as acids. Sense body position and movements: exteroceptors. Detect external stimuli: how they are distributed. Senses: each receptor will receive signal. Many biological senses do not produce conscious sensation . The duration of fire frequency also dictates adaptation ph of blood, etc: phasic receptors. Hair and smell receptors: tonic receptors.
