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Chapter 6 Q&A peripheral nervous system

by: Samantha Decker

Chapter 6 Q&A peripheral nervous system PHYS 205

Marketplace > Ball State University > Physiology > PHYS 205 > Chapter 6 Q A peripheral nervous system
Samantha Decker
Fundamentals of Human Physiology

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Notes and Q&A over the Peripheral System
Fundamentals of Human Physiology
Study Guide
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This 3 page Study Guide was uploaded by Samantha Decker on Friday September 25, 2015. The Study Guide belongs to PHYS 205 at Ball State University taught by in Summer 2015. Since its upload, it has received 25 views. For similar materials see Fundamentals of Human Physiology in Physiology at Ball State University.


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Date Created: 09/25/15
Chapter 6 review questions and answers The Peripheral Nervous System 1 Essay questions 1 Conversion of energy forms of stimuli into electrical energy by the receptor is known as sensory transduction Two types of stimulus known to which a particular receptor is most responsive is called its adaption All afferent information is sensory information During dark adaption the photopigments that are broken down during light exposure are gradually regenerated to increase the sensitivity to the eyes An optic nerve carries information from the lateral and medial halves of the same eye whereas an optic tract carries information from the lateral half of one eye to the medial half of the other Displacement of the round window does not result in sound reception it just dissipates pressure Hair cells in different regions pf the organ of Corti are activated by different tones Each taste receptor responds to just one of the ve primary tastes Rapid adaption to odors does not result from adaption of olfactory receptors Olfactory receptors themselves adapt slowly List and describe the receptor types according to their adequate stimulus a Photoreceptors are responsive to visible wavelengths of light b Mechanoreceptors are sensitive to mechanical energy Skeletal muscle receptors sensitive to stretch receptors in ears containing ne hairs that are bent as result of sound waves c Thermoreceptors are sensitive to heat and cold d Osmoreceptors detect change in the concentration of solutes in extracellular uid e Chemoreceptors sensitive to speci c chemicals including receptors for taste and smell as well as located deeper within the body that detect 02 and C02 concentrations in blood or the chemical content of the digestive tract f Nocioreceptors pain receptors sensitive tissue damage such as cutting or burning Compare tonic and phasic receptors a Tonic do not adapt or adapt slowly b Phasic adapt rapidly Explain how acuity is in uenced by receptive eld size The more closely receptors of various type are spread the smaller the area of skin each monitors The smaller the receptive eld the greater its acuity compare fast and slow pain pathways a Fast pain pathways respond to mechanical damage such as cutting or to the thermal damage such as burning b Slow pain pathways respond to chemicals released into ECF from damaged tissue Describe the builtin analgesic system of the brain The system suppresses transmission in the pain pathways as they enter the spinal cord Blocks the releases of substance P from afferent pain ber terminals 6 Describe the process of phototransduction Process of converting light stimuli into electrical signals is the same for all photoreceptors 7 Compare the functional characteristics to the rods and cones a Rods responsible for high sensitivity black and white night vision b Cones responsible for high acuity color and day vision 8 What are sound waves Wat is responsible for the pitch intensity and timbre ofsound Sound waves are traveling vibrations of air Pitch is determined by the frequency of vibrations Intensity depends of the amplitude of the sound waves Timbre depends on its overtones 9 Describe the function of each of the following parts of the ear pinna tympanic membrane oval window And include discussion about how sound waves are turned into action potentional a Pinna prominent skincovered ap of cartilage collects soud waves and channels them down the ear canal b Tympanic membrane membrane that separates the external ear from the middle ear c Oval window entrance into cochlea d Sound wave l vibration of oval window vibration of basilar membrane D beding hairs of receptor hair cells of organ of Corti as basilar membrane movement displaces these hairs in relation to overlying tectorial membrane that the hairs connect l graded potential changes receptor potential in receptor cells D changes in rate of action potentials generated in auditory nerve l propogation of action potentials to auditory cortex in temporal lobe of brain for sound perception 10Discuss functions of the semicircular canals the utricle and saccule a Semicircular canals detect rotational or angular accelerations or deceleration of the head such as wen starting or stopping spinning summersaulting or turning the head b Utricle and saccule sack like structures housed within a bony chamber situated between the semicircular canal and cochlea 11Describe the location structure and activation of th receptrs for tastes and smell Chemoreceptors generate neural signals on binding with particular chemicals in their environment Stimulation induces pleasurable or objectable sensations and signals the presence of something to seek or avoid 12Compare processes of color vision hearing taste and smell discriminations a Color vision depends on the stimulation of photoreceptors by light b Hearing is neural perception of sound energy c Taste discrimination is coded by pattern activity in various taste bud receptors d During smell detection and odor is dissected into various components Each receptor responds to only one discrete component of an odor rather than the whole odorant molecule


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