Stereocilia - Guides d'étude, Notes de cours & Résumés

Define adaptation - Answer Reduction of sensory responsiveness when stimulation is unchanging. It prevents us from having to respond continuously to unimportant information Explain the adaptation process for the visual pathway - Answer Low levels of Ca++ activate recoverin which activates rhodopsin kinase, phosphorylates rhodopsin, arrestin binds and shuts off pathway Explain the adaptation process for the auditory pathway - Answer (prolonged stimulus) Stereocilia are bent, tip links...

What are the main functions of the vestibular system? -:- - provide us with our sense of balance and head position What are the peripheral vestibular organs? -:- - semicircular canals - otolith organs What is the function of the semicircular canals? -:- - respond to head movement (turning) by detecting angular acceleration Describe the structure of the semicircular ducts. -:- - each has swelling on end (ampulla) - inside ampulla is a gelatinous mass (cupula) - cupula sits on top o...

Transduction Ans: The change in sound energy from one form to another Impedance mismatch in the ear Ans: 30 dB SPL loss at the oval window Function of the middle ear Ans: Equalizes pressure Resting potential of the scala media Ans: +80 mv Transduction stages (earliest-latest) Ans: 1. Condensation/rarefaction of air molecules 2. In and out movement of the oval and round windows 3. Back and forth movements of stereocilia 4. Depolarization and hyperpolarization of hair cells 5. Phas...

Which is a correctly ordered pathway for afferent information where immediately adjacent is NOT required? [For example, ABDG is correctly ordered alphabetically even though NOT immediately adjacent like ABCD] A) Afferent neuron - brainstem - thalamus B) Spinal cord - cerebellum - cerebral cortex C) Afferent neuron - spinal cord - cerebellar cortex D) Spinal cord - thalamus - diencephalon - ️️A) Afferent neuron - brainstem - thalamus Although he asked for a "regular" soda, Phys ...

what are the two main functions of the outer ear (pinna)? Ans: sound localization and middle ear protection Where is the endolymph found and what charge does it have? Ans: in the scala media; positive charge Where is the scala vestibuli located? Ans: in the upper portion where does a low frequency sound start on the basilar membrane? Ans: low frequency sounds start at the apex where does a high frequency sound start on the basilar membrane? Ans: high frequency sounds start at the base ...

endolymph Ans: cochlear fluid w high K, low Na tectorial membrane Ans: the stereocilia are attached to this Heschl's gyrus Ans: primary auditory cortex reticular lamina Ans: upper surface of the organ of Corti, which is composed of a tight mosaic of the tops of all the cells stria vascularis Ans: highly vascularized system of cells that maintains the ionic charge of the endolymph internal auditory canal Ans: opening in the petrous portion of the temporal bone where both the 8th and...

What structures in the middle ear are responsible for sound amplification? the tympanic membrane that vibrates through 3 ear bones that end at oval window. tympanic membrane is bigger compared to oval window What is the function of and clinical complication associated with the Eustachian tube? links the middle ear to the back of the nose Drains into the mouth to equilibrate pressure Route of bacterial entry for most ear infections What inner ear structure converts sounds waves into APs? coch...

RHSC 420 – Final Exam Practice Questions and Answers What are the main functions of the vestibular system? - Answer️️ -- provide us with our sense of balance and head position What are the peripheral vestibular organs? - Answer️️ -- semicircular canals - otolith organs What is the function of the semicircular canals? - Answer️️ -- respond to head movement (turning) by detecting angular acceleration Describe the structure of the semicircular ducts. - Answer️️ -- each ha...

What are the two sections of the vestibule? - Ans Utricle and saccule Which section of the vestibule is stimulated when nodding your head? - Ans The saccule, it stimulates the hair cells The more the hair cells bend... - Ans the higher the frequency How does the brain perceive the intensity of sound? - Ans Through the stereocilia. The greater bending, the more intense the sound In the inner ear, the vestibular system is ____ from the cochlea - Ans separate

What part of the cell contains the centrioles and the centrosomes? permuclear cytoplasm What is the function of the endocytic vesicle? moves large particles, fluid, or molecules What structure synthesizes protein for use inside cell? free ribosome The nuclear envelope has a phospholipid bilayer. True What structure regulates the passage of material between the cytoplasm and nucleus? nuclear pore What is the function of the nucleolus? ribosomal RNA synthes...