Class 11 Biology — Chapter 19: CHEMICAL COORDINATION AND INTEGRATION

What you'll learn

• ▸Endocrine System vs. Neural System
• ▸Human Endocrine Glands Overview
• ▸Role of the Hypothalamus
• ▸Anterior Pituitary Hormones and Functions
• ▸Posterior Pituitary Hormones and Functions
• ▸Disorders of Pituitary Hormones
• ▸Pineal Gland and Melatonin
• ▸Thyroid Gland Structure

Chapter Summary

--- PAGE 1 --- 11080CH22 CHAPTER 19 CHEMICAL COORDINATION AND INTEGRATION 19.1 Endocrine Glands and Hormones 19.2 Human Endocrine System 19.3 Hormones of Heart, Kidney and Gastrointestinal Tract 19.4 Mechanism of Hormone Action You have already learnt that the neural system provides a point-to-point rapid coordination among organs. The neural coordination is fast but short-lived. As the nerve fibres do not innervate all cells of the body and the cellular functions need to be continuously regulated; a special kind of coordination and integration has to be provided. This function is carried out by hormones. The neural system and the endocrine system jointly coordinate and regulate the physiological functions in the body. 19.1 ENDOCRINE GLANDS AND HORMONES Endocrine glands lack ducts and are hence, called ductless glands. Their secretions are called hormones. The classical definition of hormone as a chemical produced by endocrine glands and released into the blood and transported to …

Practice Questions from this Chapter

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1. Explain hormone's messenger role. Get Solution →
2. Describe pituitary gland functions. Get Solution →
3. Identify major endocrine glands. Get Solution →
4. Endocrine glands are also known as ductless glands because they lack what? Get Solution →
5. Which hormone is secreted by the pineal gland? Get Solution →
6. The pituitary gland is located in a bony cavity called: Get Solution →
7. Which of the following hormones are stored and released by the neurohypophysis (posterior pituitary)? Get Solution →
8. Deficiency of which element in the diet results in goitre? Get Solution →

Did you know?

• 💡 Oxytocin, a hormone, strengthens social bonds and is called the "love hormone."
• 💡 The word "hormone" comes from a Greek term meaning "to set in motion."
• 💡 Your tiny pineal gland, deep in the brain, helps regulate your sleep cycles.
• 💡 Plants use their own special hormones to grow, like auxins directing stem growth.
• 💡 Adrenaline, a hormone, can make you feel super-strong and almost fearless.

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