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Exam (elaborations)

Bio 253 Hondros Test 2 Graded A

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Job of Auditory (Eustachian) tube - maintains equal pressure on both sides of tympanic membrane connects middle ear to throat Are cranial/spinal nerves PNS or CNS? - PNS Tunic layers of Eye - Fibrous outer layer-sclera and cornea Vascula middle layer-pigmented, cont. blood vessels Nervous ...

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  • August 5, 2024
  • 13
  • 2024/2025
  • Exam (elaborations)
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  • Bio 253
  • Bio 253
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CleanA
Bio 253 Hondros Test 2 Graded A
Job of Auditory (Eustachian) tube - maintains equal pressure on both sides of
tympanic membrane
connects middle ear to throat


Are cranial/spinal nerves PNS or CNS? - PNS


Tunic layers of Eye - Fibrous outer layer-sclera and cornea
Vascula middle layer-pigmented, cont. blood vessels
Nervous inner layer-retina, rods and cones


What are the ear stones? - Otoliths-help with balance and equilibrium


Receptors activated by specific action - Thermoreceptors
Nociceptors
Mechanoreceptors


Cranial nerves that control eye movement - Oculomotor
Trochlear
Abducens


Fovea Centralis - Part of Retina that contains the highest amount of photoreceptors


Optic Disc - Optic nerve exits through here
Pt of retina the has NO photoreceptors

, where blood vessels enter eye


Sound transmission in ear - Pinna (auricle)--external auditory canal--tympanic
membrane (vibrates back and forth; pushes on the ossicles)--malleolus, incus,
stapes--fluid in the inner ear becomes wavy and stimulates mechanoreceptors (hair
cells) in the cochlea


Which receptors never experience adaptation? - Nociceptors--Pain


Receptors controlled by being stretched or pushed on - Mechanoreceptors
ie-Bladder distention


The receptor of the nose - chemoreceptors


Which structure contains tracts that carry nerve impulses to/from brain? - White
matter


Endocrine glands - ductless
release hormones
hormones travel through blood to targets


lamellated corpuscles - common in deeper subcut. tissues, tendons, ligaments
detect heavy pressure


tactile corpuscles - abundant in hairless portions of skin
detect light touch

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