- correct answer - -quick contraction of flexor muscles resulting
in the withdrawal of a limb from an injurious stimulus
-you step on a broken bottle
-even before you are consciously aware of the pain, you quickly
pull your foot away before the glass penetrates any deeper
-action involves contraction of the flexors and relaxation of the
extensors in that limb
Polysnaptic crossed flexor-extensor reflex
- correct answer - -if you were to step on lego piece with your
right foot, the pain emanating from your right foot will ultimately
cause you to flex your leg and pull your foot back or "withdraw"
from the lego piece
-however, because you've withdrawn your right foot, you are
now only standing on one leg
-just as you're about to fall over, your left leg tenses up and
stabilizes you, so you remain upright
,Extensor (tendon) reflex example
- correct answer - -in response to excessive tension on the
tendon
-inhibits muscle from contracting strongly
-moderates muscle contraction before it tears a tendon or pulls
it loose from the muscle or bone
-although the tendon reflex is less sensitive than the stretch
reflex, it can override the stretch reflex when tension is great,
making you drop a very heavy weight
Vestibulospinal reflex
- correct answer - -passes down the anterior funiculus and
facilitates neurons that control extensor muscles of the limbs,
thus inducing the limbs to stiffen and straighten
-important reflex in responding to body tilt and keeping one's
balance
Stretch reflex
- correct answer - -if your head starts to tip forward, it stretches
muscles at the back of your neck
-this stimulates their muscle spindles, which send signals to the
cerebellum through the brainstem
, -the cerebellum integrates this information and relays it to the
cerebral cortex, and the cortex sends signals back, via the
brainstem, to the muscles
-the muscles contract and raise your head.
Cerebellum function
- correct answer - -smooths and coordinates contractions of
skeletal muscles
-regulates posture and balance
-may have role in cognition and language processing.
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