ENDOCRINE GLANDS AND SOME SENSORY ORGAN OF MAMMALS

INTRODUCTION: 1) The branch of biology which deals with the study of endocrine system and its physiology is known as “Endocrinology”. 2) “Thomas Addision” is known as father of Endocrinology. Whereas the gland with duct is called exocrine gland which secretes enzyme etc. Endocrine glands pour their secretion directly into blood. These glands lack ducts, so these glands are called ductless glands. 3) Co-ordination in the body of almost all the higher vertebrates is controlled by two systems Nervous system and endocrine system. 4) Nervous system and endocrine system are called Integrative system of the body. 5) Nervous system carries informations in the form of impulses to the different parts of body. High speed services are offered by this system. 6) Where as, the work of co-ordination by endocrine system is slowly by secretion of some chemical substances. 7) Substances secreted by these glands are known as hormones. The meaning of word ‘hormone’ in Greek is “to excite” = hormaein.