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Class 7
Chapter 6 Class 7 - Adolescence: A Stage of Growth and Change (Curiosi

4.7 Understanding Hormones and Endocrine System

Last updated at April 26, 2026 by

What are Hormones?

They are chemical substances secreted by endocrine glands that regulate body activities .

Key Facts and Examples
  • Hormones are carried by blood to different body parts.
IMG016

An illustration of blood vessels carrying hormones
through the body, showing the endocrine system's
role.

Example: Testosterone travels from testes to muscles and voice box
  • Endocrine glands release hormones directly into the bloodstream .
Example: Thyroid gland releases thyroid hormone into blood vessels
  • Endocrine glands are also called ductless glands .
Example: Pituitary, thyroid, testes, ovaries have no ducts
  • Hormones regulate various body activities during puberty .
Example: Growth hormone controls height increase in teenagers
How Hormones Work Step 1 - Gland produces Endocrine gland secretes hormone Step 2 - Blood carries Hormone travels through bloodstream Step 3 - Target reached Hormone reaches target organ Body activity regulated!
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