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REFLEX
| Pronunciation (US): |  | (GB): | |
I. (noun)
Sense 1
Meaning:
An automatic instinctive unlearned reaction to a stimulus
Synonyms:
inborn reflex; innate reflex; instinctive reflex; physiological reaction; reflex; reflex action; reflex response; unconditioned reflex
Classified under:
Nouns denoting acts or actions
Hypernyms ("reflex" is a kind of...):
reaction; response (a bodily process occurring due to the effect of some antecedent stimulus or agent)
Hyponyms (each of the following is a kind of "reflex"):
hiccough; hiccup; singultus ((usually plural) the state of having reflex spasms of the diaphragm accompanied by a rapid closure of the glottis producing an audible sound; sometimes a symptom of indigestion)
sneeze; sneezing; sternutation (a symptom consisting of the involuntary expulsion of air from the nose)
shake; shiver; tremble (a reflex motion caused by cold or fear or excitement)
suckling reflex (reflex behavior in newborn mammals; includes finding and grasping the nipple in the mouth and sucking on it and swallowing the milk)
myotactic reflex; stretch reflex (reflex contraction of a muscle when an attached tendon is pulled; important in maintaining erect posture)
jump; start; startle (a sudden involuntary movement)
rooting reflex (reflex consisting of head-turning and sucking movements elicited in a normal infant by gently stroking the side of the mouth or cheek)
plantar reflex (flexion of the toes when the sole of the foot is stroked firmly on the outer side from the heel to the front in persons over the age of 2 years; under 2 years the results should be extension of the toes (Babinski reflex))
goose bump; goose pimple; goose skin; goosebump; gooseflesh; horripilation; pilomotor reflex (reflex erection of hairs of the skin in response to cold or emotional stress or skin irritation)
gag reflex; pharyngeal reflex (normal reflex consisting of retching; may be produced by touching the soft palate in the back of the mouth)
micturition reflex (relaxation of the urethral sphincter in response to increased pressure in the bladder)
mydriasis (reflex pupillary dilation as a muscle pulls the iris outward; occurs in response to a decrease in light or certain drugs)
light reflex; miosis; myosis; pupillary reflex (reflex contraction of the sphincter muscle of the iris in response to a bright light (or certain drugs) causing the pupil to become smaller)
knee-jerk reflex; knee jerk; patellar reflex (a reflex extension of the leg resulting from a sharp tap on the patellar tendon)
gulp; gulping (a spasmodic reflex of the throat made as if in swallowing)
breaking wind; fart; farting; flatus; wind (a reflex that expels intestinal gas through the anus)
electric shock; electrical shock; shock (a reflex response to the passage of electric current through the body)
oscitance; oscitancy; yawn; yawning (an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom)
defecation reflex; rectal reflex (normal response to the presence of feces in the rectum)
disgorgement; emesis; puking; regurgitation; vomit; vomiting (the reflex act of ejecting the contents of the stomach through the mouth)
blush; flush (sudden reddening of the face (as from embarrassment or guilt or shame or modesty))
blink; blinking; eye blink; nictation; nictitation; wink; winking (a reflex that closes and opens the eyes rapidly)
belch; belching; burp; burping; eructation (a reflex that expels gas noisily from the stomach through the mouth)
Babinski; Babinski reflex; Babinski sign (extension upward of the toes when the sole of the foot is stroked firmly on the outer side from the heel to the front; normal in infants under the age of two years but a sign of brain or spinal cord injury in older persons)
accommodation reflex (reflex changes in the eyes that enable an object to be focused on the retina)
Derivation:
reflex (without volition or conscious control)
II. (adjective)
Sense 1
Meaning:
Without volition or conscious control
Example:
sneezing is reflexive
Synonyms:
Classified under:
Similar:
involuntary (controlled by the autonomic nervous system; without conscious control)
Domain category:
physiology (the branch of the biological sciences dealing with the functioning of organisms)
Derivation:
reflex (an automatic instinctive unlearned reaction to a stimulus)
Context examples:
A syndrome characterized by a TONIC PUPIL that occurs in combination with decreased lower extremity reflexes.
(Holmes-Adie Syndrome, NLM, Medical Subject Headings)
This agent crosses the blood-brain-barrier and activates sigma opioid receptors on the cough center in the central nervous system, thereby suppressing the cough reflex.
(Dextromethorphan, NCI Thesaurus)
A constellation of signs and symptoms characterized by changes in personality, consciousness, and reflexes, resulting from neuropsychiatric abnormalities secondary to liver failure without evidence of other brain disease.
(Hepatic Encephalopathy, NCI Thesaurus)
Dobutamine also causes vasodilation by stimulating beta-2 adrenergic receptors in blood vessels, augmented by reflex vasoconstriction resulting in increased cardiac output.
(Dobutamine, NCI Thesaurus)
Michigan Neuropathy Screening Instrument (MNSI) Physical assessment; left ankle reflexes.
(MNSI - Left Ankle Reflexes, NCI Thesaurus)
It may occur under anesthesia or may be associated with gastroesophageal reflex disease.
(Laryngospasm, NCI Thesaurus)
Clinical signs at birth include microcephaly, hypotonia, abnormal reflexes and involuntary eye movements.
(Cerebrooculofacioskeletal Syndrome, NCI Thesaurus)
It does not produce myoneural block, nor does it affect crossed extensor reflexes.
(Orphenadrine Citrate, NCI Thesaurus)
Recently however, few studies showed that the acquisition of elementary associations such as stimulus-reflex response is possible during sleep, both in humans and in animals.
(Learning While Sleeping?, The Titi Tudorancea Bulletin)
Reflex tachycardia may occur and may be enhanced by blockade of alpha-2 receptors which enhances norepinephrine release.
(Phenoxybenzamine, NCI Thesaurus)
