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2023 BIO253 Hondros Test 2 Practice Exam with Answers (93 Solved Questions)

Test your knowledge with 2023 BIO253 Hondros Test 2 Practice Exam with Answers, which includes past exam questions and detailed solutions for thorough preparation.

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Bio 253 Hondros Test 2 -2023Job of Auditory (Eustachian) tube - ANSWERmaintains equal pressure on both sides oftympanic membraneconnects middle ear to throatAre cranial/spinal nerves PNS or CNS? - ANSWERPNSTunic layers of Eye - ANSWERFibrous outer layer-sclera and corneaVascula middle layer-pigmented, cont. blood vesselsNervous inner layer-retina, rods and conesWhat are the ear stones? - ANSWEROtoliths-help with balance and equilibriumReceptors activated by specific action - ANSWERThermoreceptorsNociceptorsMechanoreceptorsCranial nerves that control eye movement - ANSWEROculomotorTrochlearAbducensFovea Centralis - ANSWERPart of Retina that contains the highest amount ofphotoreceptorsOptic Disc - ANSWEROptic nerve exits through herePt of retina the has NO photoreceptorswhere blood vessels enter eyeSound transmission in ear - ANSWERPinna (auricle)--external auditory canal--tympanicmembrane (vibrates back and forth; pushes on the ossicles)--malleolus, incus, stapes--fluid inthe inner ear becomes wavy and stimulates mechanoreceptors (hair cells) in the cochleaWhich receptors never experience adaptation? - ANSWERNociceptors--PainReceptors controlled by being stretched or pushed on - ANSWERMechanoreceptors

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ie-Bladder distentionThe receptor of the nose - ANSWERchemoreceptorsWhich structure contains tracts that carry nerve impulses to/from brain? - ANSWERWhitematterEndocrine glands - ANSWERductlessrelease hormoneshormones travel through blood to targetslamellated corpuscles - ANSWERcommon in deeper subcut. tissues, tendons, ligamentsdetect heavy pressuretactile corpuscles - ANSWERabundant in hairless portions of skindetect light touchmicroglia - ANSWERperform phagocytosis, eat germs, clean up cellular debris when cells dieastrocytes - ANSWERdeliver nutrientshelp form synapsesregulate fluid in interstialependymal cells - ANSWERline ventriclesmove CSFcirculate CSF in ventricle of brain and central canal of spinal cordoligodendrocytes - ANSWERmake up myelin sheath in CNSschwann cells - ANSWERmake up myelin sheath in PNSdepolarization - ANSWERNa+ channels open and Na+ moves inside cellinside the cell becomes more positiverepolarization - ANSWERK+ moves out of cellgoes back to normal stateinside cell becomes more negative

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ventral roots of spinal cord - ANSWERmotor neuronsmultipolardorsal roots of spinal cord - ANSWERunipolarsensory neuronsNerves of the PNS - ANSWER12 Cranial nerves31 Spinal nervesAfferent-nerve impulse toward CNSEfferent-nerve impulse away from CNSfunction of CNS - ANSWERintegrate all cell impulses from body and send out commandsWhat does myelin sheath do? - ANSWERcovers white matterspeeds up nerve impulsesNO myelin sheath in gray matterrelative refractory - ANSWERNa+ gate channel closes--Repolarizationsaltatory conduction - ANSWERnerve impulse jumps from node-to-node in myelinatednerve fiberaction potential - ANSWERion distribution at rest in a membraneK+ inside cellNa+ outside cellabsolute refractory period - ANSWERneuron doesn't conduct any impulsesnothing happens-depoolarizationcerebral lobe resp. for voluntary movement - ANSWERfrontal lobecerebral lobe resp. for sensation - ANSWERparietal lobemidbrain - ANSWERrelays info (sensory and motor)associated with visual and auditory reflexesmovement of lips--cranial nerve - ANSWERCN VII--facial
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Subject
Biology

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