System of glands that regulate metabolism reproduction and other functions

The system of glands that  is responsible for regulation of  metabolism, reproduction, growth and development, tissue function, mood and  sleep among other things is called the Endocrine System.

A gland is a group of specialized cells that give off or secrete chemicals.

The word endocrine comes from two Greek words,  "endo" which means within and "crinis" which means to secrete or produce.

The endocrine system is made up of the following glands:

1.Pituitary gland
2.Thyroid gland
3.Adrenal glands
4.Ovaries (in females)
5.Testicles (in males)
6. Pancreas
7.Parathyroid glands

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The alveoli are what give the lungs so much space, and if they are big, there is more gas exchange than if they are small.