The Latin word gland He arrived in Spanish as gland . This is called a organ dedicated to segregate some kind of substance which is useful for the organism.
The secretion of the glands can be expelled through the mucous membranes or the skin or directed towards the blood . The substance that releases a gland can generate a certain effect in the medium it reaches or be directed towards a particular type of cell.
When the gland does not pour the substances outside through a conduit , but sends them to the blood capillaries, it is qualified as endocrine gland . This is the case of the glands that produce hormones , which are substances dedicated to regulate, inhibit or excite the activity of the organs. The Pineal gland , the thyroid gland , the Kidney glands , he hypothalamus and the hypophysis They are endocrine glands.
The exocrine glands On the other hand, they generate non-hormonal substances that are expelled by tubes towards the surface of the body , an organ or a cavity. The tear gland , the oil gland , the sweat gland , the mammary gland and the saliva gland They are part of the set of exocrine glands.
It should be noted that there are glands that develop both types of secretion (endocrine and exocrine): the so-called mixed glands , as is usually described as pancreas and at liver .
It is important to mention, finally, that the glands are also present in the plants . Its function, as in animals, is to generate secretions. There are plant species that have salt glands , to cite a case.