Pathophysiology HSC203 Exam Questions And Answers
sensory receptors/sense organs
Classified into two categories: general senses and special senses. special senses include eye and ear
What does special senses include??
Eye and Ear
Sensory receptors can be classified by?
location
E...
Pathophysiology HSC203 Exam Questions
And Answers
sensory receptors/sense organs
Classified into two categories: general senses and special senses. special senses include eye and ear
What does special senses include??
Eye and Ear
Sensory receptors can be classified by?
location
Extroreceptors
near body surface, and sometimes referred to as cutaneous receptors
Examples of extroreceptors
touch, pressure, temperature, and pain
Visceroceptors
receptors that are located internally and provide information about the environment around the
viscera
Proprioceptors
monitor the position and movement of skeletal muscles and joints
Sensory receptors that are classifies by stimuli?
Mechanoreceptors, chemoreceptors, thermoreceptors, photoreceptors, nociceptors, osmoreceptors
Mechanoreceptors
Stimulated by mechanical force:
touch, pressure, equilibrium, hearing
Chemoreceptors
Activated by a change is chemical concentration---taste , smell
Photoreceptors
respond to light (rods and cones)
Thermoreceptors
respond to changes in temperature
Nociceptors
tissue damage, sensation produced is pain
, Osmoreceptors
respond to the osmolarity of the blood (water homeostasis) concentrated in hypothalamus
Palpebrae
eyelids
Where is the eye located?
orbit of the skull- forehead
conjuctiva
mucous membrane that lines the eyelids and outer surface of the eyeball
What controls movement of eye?
Six Skeletal muscles (extrinsic muscles)
Cranial Nerves III, IV, VI
control rectus and oblique eye muscles
move and rotate eyes
Sclera (outer layer)
white part of the eye, tough fibrous coat
uvea (middle layer of eye)
made up of choroid, a dark vascular layer adjacent to sclera
Iris
a ring of muscle tissue that forms the colored portion of the eye around the pupil and controls the
size of the pupil opening
physiology of vision
light rays of an object pass through the cornea, where they are refracted, and then through the
aqueous humor , and pupil
myopia
nearsightedness; eyeball is too long
hyperopia
farsightedness; eyeball is too short
presbyopia
farsightedness associated with aging
astigmatism
defective curvature of the cornea or lens of the eye
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