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Endocrine System
 

Endocrine System

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    Endocrine System Endocrine System Presentation Transcript

    • The Endocrine System An overview of hormonal control and revision of reproductive hormones
    • The Endocrine System
      • Endocrine glands
      • Release hormones directly into the bloodstream
      • They lack ducts so are often called ductless glands .
      • Many endocrine glands have other functions e.g. pancreas, ovaries and testes
    • endocrine cell
    • endocrine cell
    • endocrine cell bloodstream
    • endocrine cell bloodstream target cell
    • endocrine cell bloodstream target cell
    • endocrine cell bloodstream target cell
    • endocrine cell bloodstream target cell
    • endocrine cell bloodstream target cell pathway of chemical coordinator in endocrine system
    • The Endocrine System
      • Hormones are released as a result of the following:
      • Direct nervous stimulation of the appropriate gland, e.g. secretion of adrenaline from the adrenal medulla occurs following stimulation by the sympathetic nervous system
      • The presence of particular compounds in the blood, such as:
      • 1. metabolites, e.g. release of insulin in response to glucose
      • 2. other hormones secreted by anterior lobe of the pituitary gland
    • The Endocrine System
      • Negative feedback loops characterise the latter two methods of controlling endocrine secretions.
    • presence of metabolite or pituitary hormone in blood
    • presence of metabolite or pituitary hormone in blood endocrine gland stimulation
    • presence of metabolite or pituitary hormone in blood endocrine gland stimulation hormone release
    • presence of metabolite or pituitary hormone in blood endocrine gland stimulation hormone release hormone release
    • presence of metabolite or pituitary hormone in blood endocrine gland stimulation hormone release hormone release removal of metabolite or inhibition of pituitary hormone release leads to
    • presence of metabolite or pituitary hormone in blood endocrine gland stimulation hormone release hormone release removal of metabolite or inhibition of pituitary hormone release leads to endocrine gland inhibition
    • presence of metabolite or pituitary hormone in blood endocrine gland stimulation hormone release hormone release removal of metabolite or inhibition of pituitary hormone release leads to endocrine gland inhibition no hormone released leads to
    • presence of metabolite or pituitary hormone in blood endocrine gland stimulation hormone release hormone release removal of metabolite or inhibition of pituitary hormone release leads to endocrine gland inhibition no hormone released leads to leads to
    • The Endocrine System
        • Compounds are classed as hormones if they:
        • are released into the blood by a ductless gland
        • are carried by the bloodstream to a target organ
        • stimulate a change in the activity of the target organ
    • Reproductive hormones
      • Female
      • Follicle stimulating hormone , simulate the small follicles in the ovary which contain the developing egg
      • Oestrogen , secreted by the developing egg, a mixture of hormones that promote secondary sexual characteristics and the uterine lining
      • Luteinising hormone stimulates the follicle to produce progesterone to maintain pregnancy after the release of the egg
    • Reproductive hormones
      • Male
      • Luteinising hormone stimulates groups of cells in the testes to produce androgens
      • Testosterone the major androgen which initiates and maintains secondary sexual characteristics in the male and stimulates sperm production