Summary: Endocrine System 5

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  • 1.26 endocrine system 5

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  • thyroid axis of control process

    hypothalamus
    releasing hormones
    anterior pituitary 
    release thyroid-stimulating hormone
    thyroid gland
    thyroid hormone
  • gonadal axis process

    hypothalamus
    releasing hormone
    anterior pituitary
    lutienizing and follicle-stimulating hormones
    testes and ovaries
    testosterone and ovaries
                            estrogen and progesterone
  • found at the base of the throat, wrapped around the trachea

    thyroid gland
  • consists of two lobes and a connecting isthmus

    thyroid gland
  • thyroid hormones composition

    two linked tyrosine with 3 or 4 iodine atoms
  • majority of released thyroid hormone is

    T4
  • at targeted issues, T4 is converted to

    T3 because its more active
  • thyroid hormone and metabolic rate relationship

    direct (up for up, down for down)
  • thyroid hormone effects

    drives metabolic rate
    break down of large molecules
    increase small molecule consumption 
    important in embryo, fetus, and early childhood development
    have to be with sec hormones to affect reproductive systems
  • goiters, cretinism, hypothyroidism, and hyperthyroidism are

    thyroid disorders

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