The Endocrine System

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The Endocrine System
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The Endocrine System

• The other control system of the body working
  with the nervous system
• Chemical control - releases hormones into the
  blood
• Function - maintenance of homeostasis by changing
  physiological activity of cells

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The Endocrine System

• Organs not anatomically connected spread
  throughout body tissues
• Organs usually arise from epithelial tissue
• Endocrine organs are very small only total
  about 110 grams in the human body

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The Major Endocrine Organs

• pituitary (hypophysis) - anterior posterior
• thyroid parathyroid
• adrenals - cortex medulla
• pancreas
• gonads - ovaries testes
• pineal
• thymus

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Categories of Hormones

• 1. Steroid Hormones
• derived from cholesterol
• produced in gonads adrenal cortex
• 2. Non - Steroid Hormones
• derived from amino acids
• produced by other glands
• most common type of hormone

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Control of Hormones

• 1. Hypothalamic Control
• Hypothalamus produces chemical regulating factors
  - releasing and inhibiting
• these regulating factors act on the anterior
  pituitary gland
• 2. Nervous System Control
• Nerve impulses to posterior pituitary
• Autonomic stimulation of the adrenal medulla
• 3. Circulating Hormone Levels
• Typically hormones are controlled by a negative
  feedback system

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Hormones Actions (see workbook)
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