Bio 253 Hondros Test 2 exam with complete solution 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 eyeSound 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 - Mech