WordNet

manage or run; "tend a store"
have a tendency or disposition to do or be something; be inclined; "She tends to be nervous before her lectures"; "These dresses run small"; "He inclined to corpulence" (同)be given, lean, incline, run
have care of or look after; "She tends to the children"
a mythical Greek hero of the Iliad; a foremost Greek warrior at the siege of Troy; when he was a baby his mother tried to make him immortal by bathing him in a magical river but the heel by which she held him remained vulnerable--his `Achilles heel
an automatic instinctive unlearned reaction to a stimulus (同)reflex response, reflex action, instinctive reflex, innate reflex, inborn reflex, unconditioned_reflex, physiological reaction
seemingly contradictory but nonetheless possibly true; "it is paradoxical that standing is more tiring than walking" (同)self-contradictory
a cord or band of inelastic tissue connecting a muscle with its bony attachment (同)sinew

PrepTutorEJDIC

〈人が〉(…の)『傾向がある』,(…)しがちである / 〈物事が〉(ある方向に)向かう,(ある状態に)向かう
〈人・動植物など〉‘の'『世話をする』,めんどうをみる / 《米》〈店〉‘の'番をする / 《tend to+名》…に気をつける,心を配る
アキレス(Homer作のIliadに出てくるギリシア軍の勇将;右足首以外は不死身であったが,ここに矢を射られ戦死をとげたという.このため,「唯一の弱点」のことを『Achilles' heel』「アキレスのかかと」という.《米》では'(アポストロフィ)をつけない)
反射(刺激に対する無意識の反応) / 《複数形で》反射的な動き / (光などの)反射,反射光;映像 / 反射性の / (カメラが)レフ鋼の,反射型の
逆説の;逆説を好む / 矛盾する
腱(けん)

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Loram ID1, Maganaris CN, Lakie M.
Medicine and science in sports and exercise.Med Sci Sports Exerc.2009 Jan;41(1):198-204. doi: 10.1249/MSS.0b013e318183c0ed.
Undisturbed human standing is primarily characterized by sway of the whole body about the ankle joints and is regulated primarily by the calf muscles. Traditionally, in accord with normal ideas of postural control, ankle stiffness, enhanced by spindle mediated muscle stretch reflexes, has been consi
PMID 19092688

Active, non-spring-like muscle movements in human postural sway: how might paradoxical changes in muscle length be produced?

Loram ID1, Maganaris CN, Lakie M.
The Journal of physiology.J Physiol.2005 Apr 1;564(Pt 1):281-93. Epub 2005 Jan 20.
In humans, during standing the calf muscles soleus and gastrocnemius actively prevent forward toppling about the ankles. It has been generally assumed that these postural muscles behave like springs with dynamic stiffness reflecting their mechanical properties, reflex gain including higher derivativ
PMID 15661825

[Thyroid hormones and their paradoxical effect on the Q-Kd interval, on the Achilles tendon reflex time course, and on serum cholesterol concentration in patients with hypothyroidism (author's transl)].