Endocrine System
The Endocrine System is made up of glands that release chemicals (hormones) into the bloodstream. These chemicals influence almost every cell, organ and function of our bodies. The Endocrine System is active in regulating mood, growth and development, tissue function, and metabolism as well as sexual function and reproductive processes. The Endocrine and Nervous Systems often work together to enable the body to function properly.

Adrenal Glands- Release epinephrine and norepinephrine which help the body to respond to stress.

Thymus-During childhood the thymus releases thymosine which stimulates T cell development, proper immune response.
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Parathyroid Glands- These four glands release parathyroid hormone which regulates the level of calcium in the blood.
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Thyroid- Produces thyroxine which regultes metabolism throughout the body.

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Pineal Gland- Releases melatonin, which is involved in rhythmic activities such as daily sleep and wake cycles.
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Pancreas- Produces insulin and glucagon, which regulate the level of glucose (sugar) in the body.

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Ovaries- They produce estrogen and progestrogen. Estrogen is required for the devleopment of female secondary sex charcterictics and for the development of eggs. Progestrogen prepares the uterus for a fertilized egg.
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Testes- Produce testosterone, which is responsible for sperm production and the devlopment of male secondary sex charcteristics.