Humans reproduce sexually when two different persons mate, the male (♂) and the female (♀) using a special system called the reproductive (genital) system, Man can’t reproduce asexually but he only reproduces sexually because...
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...
