Use the drop-down menus to determine which structures of the endocrine system are described below. connects the endocrine system to the nervous system called the “master gland” of the endocrine system secretes a hormone that regulates sleep cycles regulates the development and differentiation of t lymphocytes

•Hypothalamus-connects the endocrine system to the nervous system.

It is a structure within the brain which secretes the hormones – releasing hormones which than stimulate or inhibit the secretion of hormones from the pituitary gland.

•Pituitary gland (hypophysis) - called the “master gland” of the endocrine system  

It is a three-lobe endocrine gland: The anterior pituitary (regulates growth, stress, reproduction), intermediate lobe (secretes melanocyte-stimulating hormone) and posterior pituitary (connection to the hypothalamus).

•Pineal gland - secretes a hormone that regulates sleep cycles.

Pineal gland is located in the epithalamus and it secretes melatonin hormone that regulates circadian and seasonal cycles.

•Thymus - regulates the development and differentiation of T lymphocytes

Thymus is a lymphoid organ of the immune system where the T lymphocytes mature.

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