Endocrine Glands, Hormones and their Functioning
The endocrine system is an integrated system of small organs that involve the release of extra-cellular signaling chemical molecules known as hormones. The endocrine system is instrumental in regulating metabolism, growth, development and puberty, tissue function, and also plays a part in determining mood.
Some major endocrine glands are the pituitary, thyroid, and adrenal glands. Features of endocrine glands are, in general, their ductless nature, their vascularity, and usually the presence of intracellular vacuoles or granules storing their hormones.