This song is available on Lyrical Learning's Lyrical Life Science Volume 3: 
The Human Body.

Your body has two kinds of glands: exocrine which means "outside," and endocrine which means "inside." Exocrine glands secrete (release) their chemicals into ducts (tubes) that carry them outside your body. For example, sweat glands secrete perspiration (sweat). Exocrine glands also secrete chemicals into ducts that flow into body cavities. for example, salivary glands release saliva into your mouth.
     The endocrine glands empty their chemicals, hormones, directly into blood vessels to be carried throughout your body. Hormones are chemical messengers that stimulate other activities and processes. Sex hormones, for example, cause boys and girls to develop to sexual maturity, but other hormones control lifelong activities like digestion, production of urine, and even the preparation of your body to respond to emergencies. 

Ductless glands that are within
They are called the endocrine
Make chemicals that flow within; 
And work with the nervous system
Hormones, hormones
Chemical messengers are what you call the hormones

Each gland produces one or more hormones
With names that end with "...ins" and "...ones"
Cortisone, testosterone are just two of the hormones
Hormones, hormones
Estrogen, progesterone are two more of the hormones

Adrenal makes adrenaline
Fight or flight that comes from them
Pancreas makes insulin
Milk begins with prolactin
Hormones, hormones
The quantity is so tiny but you need all your hormones

Thyroid and the ovaries
Pituitary and the testes
All the glands they do secrete directly in the bloodstream
Hormones, hormones
Stimulate body functions: 
The duty of your hormones

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