Examlex
Open-market operations is the buying and selling of government securities by the Federal Reserve Board.
Posterior Pituitary
An extension of the brain located at the base of the skull responsible for the secretion of hormones like oxytocin and vasopressin.
Metanephros
Most caudally located of the three excretory organs appearing during embryonic development; becomes the permanent kidney of mammals. In mammalian embryos, it is formed caudal to the mesonephros and develops later as the mesonephros undergoes regression.
Pronephros
In the embryos of higher vertebrates, a series of tubules emptying into the celomic cavity. It is a temporary structure in the human embryo, followed by the mesonephros and still later by the metanephros, which gives rise to the kidney.
Mesonephros
A temporary kidney structure found during the embryonic development of mammals, later replaced by the permanent kidneys.
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