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Endocrine System and Adolescence — Revision Notes

ICSE · Class 8 · Biology

Endocrine System and Adolescence revision notes for ICSE Class 8 Biology: 4 topics in quick points. Part of the ICSE Class 8 Biology syllabus.

43 questions35 flashcards5 concepts

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A comparison chart highlighting the key differences between endocrine (ductless) glands and exocrine (ducted) glands, including their secretions and how they are released.
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Key Topics to Revise

1

1. Endocrine System and Hormones

  • The body has two types of glands: exocrine glands and endocrine glands.
  • Exocrine glands send their secretions through ducts to target organs.
  • Endocrine glands are ductless glands and pour their secretions directly into the blood.
2

2. Thyroid Gland

  • The thyroid is a bilobed gland situated on either side of the wind pipe, just below the larynx.
  • It secretes thyroxine.
  • Thyroxine is an iodine-containing protein.
3

3. Adrenal Glands

  • The adrenal glands are like caps over the kidneys.
  • Each adrenal gland has two parts: a central medulla and a peripheral cortex.
  • The medulla secretes adrenaline.
4

4. Pancreas, Insulin and Glucagon

  • The pancreas is situated behind the stomach.
  • It is mainly a digestive gland, but it also has hormone-secreting Islets of Langerhans.
  • Islets of Langerhans secrete insulin and glucagon.

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Full Notes

Key Concepts

Exocrine glands send secretions through ductsA hormone is a chemical substanceThe thyroid gland is a bilobedInsufficient thyroxine causes simple goitreThe adrenal glands are like caps

Frequently Asked Questions

What are the important topics in Endocrine System and Adolescence for ICSE Class 8 Biology?
Key topics in Endocrine System and Adolescence include Endocrine System and Hormones, Thyroid Gland, Adrenal Glands, Pancreas, Insulin and Glucagon. Study these first, then practise questions on each for Class 8 exams.
How should I revise Endocrine System and Adolescence for Class 8 exams?
Learn the core ideas first, then work through the 43 practice questions on Endocrine System and Adolescence. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All ICSE Class 8 Biology Revision Notes

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