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Control and Coordination

Neural Tissues (Group A)

We salivate when we see delicious food; we feel tense or anxious while making important decisions; we digest different types of food that we ingest; children grow taller during the early years of their life; voices of boys crack during puberty; lactation begins during motherhood. Do you know why these changes occur? How does the body control these functions? Is there another system governing these complex functions? Let us explore.


A hormone is a chemical messenger that regulates physiological processes in living organisms. It is secreted by a gland.

The regulation of the physiological processes, control and coordination by hormones is governed by the endocrine system. The nervous system, along with the endocrine system in our body, controls and coordinates the physiological processes.

Characteristics of hormones:

  • Hormones act as chemical messengers.

  • They are secreted by living cells/tissues or organs called glands.

  • They are secreted in very small quantities by glands.

  • They act upon specific cells, tissues, or organs called the target sites.

  • They are generally slow in action, but have long lasting effects.

  • They either accelerate or inhibit a reaction.


A cell, tissue, or an organ that secretes hormones required for a specific function is ca…

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