Testosterone is a steroid formed by the interstitial cells of Leydig. Leydig cells are almost non-existent in the testes during childhood, but they are numerous in the newborn male infant and also in the...
Human belongs to the class Mammalia which is characterized by the development of the embryo inside the uterus till birth, So, their ova are small and nearly devoid of yolk (because the embryo depends...
Adrenal (suprarenal) glands are two glands, where each one of them is located above one of the two kidneys, Each gland consists anatomically and physiologically of two regions which are: the outer part which...
Most important endocrine glands They are the glands of the endocrine system which secrete their hormones directly into the blood rather than through the duct , The main glands of the endocrine system include...
