National Research Council
In the United States, a part of the National Academies. There are also National Research Councils in Canada, the UK, and other countries.
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- Natriuresis
The excretion of an excessively large amount of sodium in the urine. Natriuresis is similar to diuresis (the excretion of an unusually large quantity of urine), except that in natriuresis the urine is exceptionally salty. Natriuresis occurs with some diuretics and diseases (as of the adrenal) and can lead to the salt-losing syndrome characterized by […]
- Natriuretic
Causing natriuresis, the excretion of an excessively large amount of sodium in the urine. A hybrid of the Latin natrium = sodium and the Greek ouresis = a making water.
- Natriuretic peptide
A-type natriuretic peptide is secreted largely by the atrial myocardium in response to dilatation. B-type natriuretic peptide is manufactured mainly by the ventricular myocardium. C-type natriuretic peptide is produced by endothelial cells that line the blood vessels. B-type natriuretic peptide is useful in the diagnosis of heart failure. The finding of a low level of […]
- Natural family planning
Also known as fertility awareness, periodic abstinence and the rhythm method, this approach entails not having sexual intercourse on the days of a woman’s menstrual cycle when she could become pregnant or using a barrier method (such as a condom, the diaphragm or a cervical cap) for birth control on those days. Because a sperm […]
- Natural menopause
Natural menopause occurs when the ovaries naturally decrease their production of the sex hormones estrogen and progesterone; there are no menstrual periods for 12 consecutive months; and no other biological or physiological cause can account for this. Menopause is the end of the childbearing years. (It is important to remember that until 12 months have […]