Published in Zoology
Tuesday, 30 May 2017 00:15
The glands are secretory in function. The glands are of two types, viz.,
  1. exocrine and
  2. endocrine glands.

The secretions of endocrine glands are called "hormones". The hormones do not pass through ducts, hence the glands are also called "ductless glands". But hormones are distributed to the various organs through the blood. Hence such glands are termed as "endocrine glands" [endo-internal; crinin-secretion].

The various systems are co-ordinated by nervous and endocrine systems. These two systems together called "integrated system". The endocrine system can not influence the organs rapidly as the nervous system does.

The term hormone was proposed by "Bayliss" and "Starling". Hormones are biocatalysts, which are required in small amounts. These do not participate in biochemical reactions. Hence hormones are aslo called "automones" or "autocoids". These are secreted in organs, but their action is else where i.e normally other than the endocrine glands. For example, the follicle stimulating hormone of pituitary acts on gonads. The hormones carry informations or messages to the "target organs" [target organ = organ which is subjected to the action of hormone].

Hormones regulate a variety of physiological activities, like growth, reproduction, temperature, sexual dimorphism etc. Hormones mainly maintain the internal environment or "homeostasis" by messages. Hence hormones are also called "informational molecules" or "chemical messengers".




CHOLERA is a specific infectious disease that affects the lower portion of the intestine and is char...

Useful Sites

  • NCBI

    National Center for Biotechnology Information
  • LTO

    Lab Tests Online® by AACC
  • ASCP

    American Society for Clinical Pathology
  • ASM

    American Society for Microbiology
  • The Medical Library®

    Project of BioScience.pk

Connect With Us

Contact Us

All comments and suggestions about this web site are very welcome and a valuable source of information for us. Thanks!

Tel: +(92) 302 970 8985-6

Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

Website: https://www.bioscience.pk

This website is certified by Health On the Net Foundation. Click to verify. This site complies with the HONcode standard for trustworthy health information:
verify here.

Our Sponsors

InsightGadgets.comPathLabStudyTheMedicalLibrary.orgThe Physio Club

By using BioScience.pk you agree to our use of cookies to enhance your experience on this website.