| renidification | <zoology> The act of rebuilding a nest. Source: Websters Dictionary (01 Mar 1998) |
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| renifleur | A sniffer; one who is sexually excited by odours. Origin: Fr. (05 Mar 2000) |
| reniform | Having the form or shape of a kidney; reniform; as, a kidney-shaped leaf. (01 Mar 1998) |
| reniform pelvis | A modified cordate pelvis, with a long transverse diameter, giving the brim a kidney shape. (05 Mar 2000) |
| renin | <enzyme> An enzyme of the hydrolase class that catalyses cleavage of the leucine leucine bond in angiotensin to generate angiotensin. 1. The enzyme is synthesised as inactive prorenin in the kidney and released into the blood in the active form in response to various metabolic stimuli. Not to be confused with rennin (chymosin). (25 Jun 1999) |
| renin-angiotensin system | <physiology> A system consisting of renin, angiotensin-converting enzyme, and angiotensin II. Renin, an enzyme produced in the kidney, acts on angiotensinogen, an alpha-2 globulin produced by the liver, forming angiotensin I. The converting enzyme contained in the lung acts on angiotensin I in the plasma converting it to angiotensin II, the most powerful directly pressor substance known. It causes contraction of the arteriolar smooth muscle and has other indirect actions mediated through the adrenal cortex. (25 Jun 1999) |
| renin-angiotensin-aldosterone system | The hormones, renin, angiotensin, and aldosterone work together to regulate blood pressure. A sustained fall in blood pressure causes the kidney to release renin. This is converted to angiotensin in the circulation. Angiotensin then raises blood pressure directly by arteriolar constriction and stimulates adrenal gland to produce aldosterone which promotes sodium and water retention by kidney, such that blood volume and blood pressure increase. (05 Mar 2000) |
| reniportal | 1. Relating to the hilum of the kidney. 2. Relating to the portal, or venous capillary circulation in the kidney. Origin: reni-+ L. Porta, gate (05 Mar 2000) |
| renitency | The state or quality of being renitent; resistance; reluctance. "We find a renitency in ourselves to ascribe life and irritability to the cold and motionless fibres of plants." (E. Darwin) Origin: Cf. F. Renitence. Source: Websters Dictionary (01 Mar 1998) |
| renitent | 1. Resisting pressure or the effect of it; acting against impluse by elastic force. "[Muscles] soft and yet renitent." 2. Persistently opposed. Origin: L. Renitens, -entis, p. Pr. Of renit to strive or struggle against, resist; pref. Re- re- + niti to struggle or strive: cf. F. Renitent. Source: Websters Dictionary (01 Mar 1998) |
| rennase | <enzyme> The predominant milk-clotting enzyme from the true stomach or abomasum of the suckling calf. It is secreted as an inactive precursor called prorennin and converted in the acid environment of the stomach to the active enzyme. Registry number: EC 3.4.23.4 (12 Dec 1998) |
| rennet | <zoology> The inner lining of the fourth stomach of the calf of a ruminant (such as a cow). It is used to make cheese because it produces the enzyme rennin. (09 Oct 1997) |
| rennin | <enzyme> A proteolytic enzyme that isused to curdle milk to make cheese. Rennin is typically used in the form of rennet, a commercial preparation taken from the abomasum of young calves, but because the demand for rennin is so great, the cheese industry is increasingly turning to rennin-producing microbes such as Mucor miehei and Mucor pusillus. (25 Jun 1999) |
| renninogen | Rennogen Synonym: prochymosin. Origin: rennin + G. -gen, producing. (05 Mar 2000) |
| reno- | Reni- The kidney. See: nephro-. Origin: L. Ren (05 Mar 2000) |