CH45 - Chapter 45 Hormones and the Endocrine System...

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Chapter 45 Hormones and the Endocrine System Hormones • A hormone is a chemical signal – Secreted into the circulatory system – Communicates regulatory messages to the body – May reach all parts of the body – Only certain tissues respond to specific hormones – Non-target cells are unaffected by the hormone • Examples of Hormones: – Oxytocin – Prolactin – Insulin – Progesterone – Melatonin – Testosterone – Estrogen Endocrine Glands Endocrine glands are organs that secrete hormones They are “ductless” glands because they secrete products directly into extracellular fluid Products then diffuse into the circulatory system Humans have nine types of major endocrine glands. – Hypothalamus – Anterior Pituitary – Posterior Pituitary – Pineal Gland – Thyroid Glands – Parathyroid Glands – Adrenal Glands – Pancreas – Ovaries/Testes Hypothalamus • “Master Gland” Located in the brain • Links the Nervous System to the Endocrine System via the Pituitary Gland It secretes “releasing hormones” that stimulate the pituitary gland to secrete hormones It secretes “inhibiting hormones” that prevent the pituitary gland from secreting hormones
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Pituitary Gland Has two discrete parts (which are actually two discrete glands)
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This note was uploaded on 03/27/2012 for the course BIO 1442 taught by Professor Britton during the Spring '11 term at University of Florida.

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CH45 - Chapter 45 Hormones and the Endocrine System...

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