BIO 253 EXAM 2 LATEST ACTUAL EXAM 100
QUESTIONS AND CORRECT DETAILED ANSWERS
WITH RATIONALES |AGRADE
Terms in this set (157)
1 sweet = stimulated by carbs
2. sour = stimulated by acids ( H+)
3. salty = stimulated by salts (N a+ o+ r)
5 primary taste sensations
4. bitter = stimulated by organic compounds Mg and Ca
salts
5. Umami = stimulated by some amino acids MSG
- primarily motor nerve
- motor impulses to one pair of muscles that move the
Abducense Nerve (VI)
eyes
- some sensory
- primarily motor nerve
- formerly called spinal accessory
contain cranial and spina brahcnes
Accessory Nerve (XI) cranial= join vagus N, motor to muscles of soft palate,
pharynx and larynx
Spinal= motor to muscles of neck and back. small
sensory component
- connects middle ear to throat
- helps maintain = pressure on both sides of tympanic
Auditory (Eustachian) Tube
membrane
- usually closed by valve- like flaps in throat
, - 3 tiny bones
- vibrate in response to tympanic membrane vibrations
Auditory Ossicles MIDDLE
amplify force
EAR
- malleus, incus and stapes
- hammer, anvil and stirrup
first part of axon contains many voltage-gated sodium
Axon Hillock/ Initial
channels. where the threshold is reached, voltage- gated
Segment/ Trigger Zone
Na+ channels open (Beginning of the action potential)
respond to changes in chemical concentrations ( taste,
Chemorceptors
smell, oxygen concentration)
- keeps fluid pressure in ventricles contant
- can lead to collapse of cerebral blood vessels injury of
Clinical Application of
brain tissue compressed against skull
Cerebrospinal Fluid
- spinal tap/ lumbar puncture is used to measure CSF
Pressure
pressure
- hydrocephalus in infant can be treated with a shunt
Cochlea INNER EAR functions in hearing
- middle compartment
Cochlear Duct COCHLEA
- portion of membranous labyrinth in cochlea
- S shaped tube
External Acoustic Meatus - lined with ceruminous glands
OUT EAR - carries sound to tympanic membrane
- terminates at tympanic membrane
- mixed nerve
- special sensory from taste receptors
Facial Nerve (VII)
- somatic motor to muscle of facial expression
- autonomic motor to tear glands, and salivary glands
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