BIO 253 EXAM 2 2026-2027 100 QUESTIONS AND

BIO 253 EXAM 2 2026-2027 100 QUESTIONS AND

BIO 253 EXAM 2 2026-2027 100

QUESTIONS AND CORRECT DETAILED ANSWERS WITH

RATIONALES

What is the pathway for hearing - ANSWER- Pinna, external auditory

meatus, tympanic membrane, bone ossicle, oval window, scala vestibuli,

helicotrema, scala tympani, spiral organ, hair cells, cochlear nerve,

auditory cortex

Mechanoreceptors different types and what is it for - ANSWER- Touch

and pressure

Vicero mechanoreceptors (eating and digestion and kidney filtration)

Hair cells in the ear absorb sound waves

Chemoreceptors - ANSWER- Taste

Viseral chemo receptors - ANSWER- Homeostasis that checks level

such as hydrogen oxygen sodium levels

Thermoreceptors - ANSWER- respond to changes in temperature adapts

Nocireceptors - ANSWER- pain receptors

Do not adapt

Proprioceptors - ANSWER- monitor the position and movement of

skeletal muscles and joints

Photoreceptors - ANSWER- respond to light

What plexus does the phrenic nerve belong to - ANSWER- Cervical

plexus

What plexus does the radial and median and ulnar nerves belong to -

ANSWER- Brachial plexus

What plexus does the sciatic nerve belong to - ANSWER- Lumbosacral

plexus

What is a plexus - ANSWER- A safeguard or alternate pathway such as

if somebody is injured in their sign they may be able to walk again due

to a plexus

What cranial nerves control eye movement - ANSWER- Trochler

Occulomotor

Abducens

What is the vagus nerve - ANSWER- The longest running cranial nerve