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Hondros Bio 253 exam Questions with 100% correct verified answers 2024 Updated
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Hondros Bio 253 exam Questions with 100% correct verified answers 2024 Updated
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Hondros Bio 253 exam Questions with 100% correctverified answers 2024 Updated
Job of Auditory (Eustachian) tube - ANSWERmaintains equal pressure on both sides of
tympanic membrane
connects middle ear to throat
Are cranial/spinal nerves PNS or CNS? - ANSWERPNS
Tunic layers of Eye - ANSWERFibrous outer layer-sclera and cornea
Vascula middle layer-pigmented, cont. blood vessels
Nervous inner layer-retina, rods and cones
What are the ear stones? - ANSWEROtoliths-help with balance and equilibrium
Receptors activated by specific action - ANSWERThermoreceptors
Nociceptors
Mechanoreceptors
Cranial nerves that control eye movement - ANSWEROculomotor
Trochlear
Abducens
Fovea Centralis - ANSWERPart of Retina that contains the highest amount of
photoreceptors
Optic Disc - ANSWEROptic nerve exits through here
Pt of retina the has NO photoreceptors
where blood vessels enter eye
Sound transmission in ear - ANSWERPinna (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? - ANSWERNociceptors--Pain
Receptors controlled by being stretched or pushed on - ANSWERMechanoreceptors
ie-Bladder distention
The receptor of the nose - ANSWERchemoreceptors
, Which structure contains tracts that carry nerve impulses to/from brain? -
ANSWERWhite matter
Endocrine glands - ANSWERductless
release hormones
hormones travel through blood to targets
lamellated corpuscles - ANSWERcommon in deeper subcut. tissues, tendons,
ligaments
detect heavy pressure
tactile corpuscles - ANSWERabundant in hairless portions of skin
detect light touch
microglia - ANSWERperform phagocytosis, eat germs, clean up cellular debris when
cells die
astrocytes - ANSWERdeliver nutrients
help form synapses
regulate fluid in interstial
ependymal cells - ANSWERline ventricles
move CSF
circulate CSF in ventricle of brain and central canal of spinal cord
oligodendrocytes - ANSWERmake up myelin sheath in CNS
schwann cells - ANSWERmake up myelin sheath in PNS
depolarization - ANSWERNa+ channels open and Na+ moves inside cell
inside the cell becomes more positive
repolarization - ANSWERK+ moves out of cell
goes back to normal state
inside cell becomes more negative
ventral roots of spinal cord - ANSWERmotor neurons
multipolar
dorsal roots of spinal cord - ANSWERunipolar
sensory neurons
Nerves of the PNS - ANSWER12 Cranial nerves
31 Spinal nerves
Afferent-nerve impulse toward CNS
Efferent-nerve impulse away from CNS
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