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How is communication among the parts of an organism is accomplished ?


Endocrine system is controlled by brain. Hypothalamus secretes releasing hormones which excite synthesis of various hormones from pituitary gland. The hormones of pituitary gland regulate hormonal release from thyroid, adrenal gland, gonads etc.

Hormonal response is selective but specific.

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Which endocrine glands are controlled by the secretion of other glands.

Endocrine glands are controlled by the secretion of other glands in the following way:

Hypothalamus controls the secretion of the hormones of the pituitary glands. Hormone like Gonadotrophin releasing hormone (GnRH) Thyroid stimulating hormone releasing hormone (TSH-RH) regulates the pituitary hormones like Growth hormone (GH) and TSH respectively. 

The pituitary gland hormones regulate the secretion of the hormones of the other glands. Pituitary secretes hormones like
i. TSH -Thyroid stimulating hormone which acts on thyroid glands.
ii.  ACTH-Adrenocorticotropic hormones which act on the adrenal gland.
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