Chemical Coordination and Integration, Part 1: Endocrine glands, pituitary, feedback and thyroid: visual lesson, ISC Class 11 Biology

Lesson

Hormones and chemical coordination

Part 1: the glands, the pituitary and the thyroid.

In this lesson you will

Locate the endocrine glands and state the hormones of the hypothalamus and pituitary
Explain the negative feedback control of thyroxine secretion
State the functions of thyroxine, calcitonin and parathormone, and of the pineal gland and thymus

Concept

Nervous and endocrine coordination

A hormone is a chemical produced by an endocrine gland, carried in the blood, and acting in small amounts on target cells.

Table comparing nervous and endocrine coordination
Feature	Nervous system	Endocrine system
Messenger	Electrical impulse and neurotransmitter	Hormone in the blood
Speed	Very fast	Slower
Duration of effect	Short	Longer
Reach	Specific cells	Any cell with the receptor

Diagram

The endocrine glands of the human body

The hypothalamus, pituitary, pineal, thyroid, 4 parathyroids, thymus, adrenal glands, pancreas and gonads (ovaries and testes) are the main endocrine organs.

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