EEEK Flashcards
(29 cards)
nociceptors
pain
density varies by location
sensitive to:
thermoreceptors
- temperature
- located in skin, muscles, liver, hypothalamus
- 3-4 cold receptors for every 1 warm receptors
mechanoreceptors
sensitive to stimuli that stretch, twist, or compress 3: tactile baroreceptors proprioceptors
Tactile receptors
touch
6 types of skin receptors, from free nerve endings to specialized
baroreceptors
pressure
- regulation of autonomic activities
- free nerve endings embedded in walls of distensible organs (digestive, excretory, respiratory, blood vessels)
proprioceptors
position
- free nerve endings
position of joints, state of muscular contractions, tension in tendons and ligaments
sense of body position coordinates here and with inner ear
chemoreceptors
respond to water- and lipid soluble substances dissolved in surrounding fluid
-autonomic regulation
respiratory (CO_2 and O_2) and CV function (H+)
Special senses
located within specific structures and more complex in structure
3
photoreceptors
mechanoreceptors
functions of the ear
hearing and equilibrium (balance)
outer ear
Auricle (pinna)
Auditory canal
tympanum (ear drum)
3 divisions of the ear
outer ear
Middle ear
Inner ear
Cerumen
(ear wax)
Middle Ear
hammer, anvil, and stirrup
- (malleus, incus, and stapes)
oval window
Eustachian tube equalizes pressure on either side of eardrum
- connects to nasopharynxInner ear
vestibule
cochlea
semicircular canal
Mechanoreceptors: Hair cells
- hair cell communicates with sensory neuron by continual release of neurotransmitters
- Eternal force moves cilia, causing increase or decrease of neurotransmitter release
dynamic equilibrium
maintains balance when head and body move suddenly
static equilibrium
maintains body posture and stability when body is motionless
2 main types of hearing loss
inner ear: auditory nerve damage- Permanent sound waves cannot reach inner ear - earwax buildup - fluid buildup -ear drum puncture
balance problems
result of:
- head injury
- localized disorders of blood circulation
- infection
- age
sensory receptors
senses located in the PNS
receptors are the dendrites of sensory neurons
- free nerve endings - sensitive to multiple stimuli
- complex receptors- sensitive to one stimuli
receptive field
area monitored by single receptor field
when does adaptation occur
jumpinto into a pool, putting on perfume,
adaptation
reduction in sensitivity to presence of constant stimulus
can increase or decrease amount of sensroy info coming in by “tuning in/ out”
what percent of sensory info reaches the cerebrum
1%
