endocrine system feedback mechanisms

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  • Created by: Zina_
  • Created on: 26-04-18 20:03

endocrine system anatomy

  • Image result for the endocrine system anatomyhypothalamus and posterior pituitary gland connected through the infundibulum
  • beneath the hypothalamus have the sellaturcica which splits into the anterior and pituitaty glands
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general pituitary gland negative feedback

Image result for negative feedback of hypothalamus

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thyroid gland structure

Image result for thyroid gland structure (http://people.upei.ca/bate/assets/images/302.gif)

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what is the thyroid gland tissue made of?

made of follicular cells arranged in thyroid follicle spheres

follicles spheres  filled with colloid (fluid, precursor for hormones)

thyroid hormones mainly consisting of iodine and tyrosine 

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anterior pituitary positive feedback for TSH

ANTERIOR PITUITARY 

+

TSH

+

THYROID GLAND

+

T3/T4 THYROID HORMONE

+

INC IN METABOLIC RATE 

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anterior pituitary positive feedback for ACTH

ANTERIOR PITUITARY 

+

ACTH HORMONE 

+

ADRENAL CORTEX

CORTISOL

METABOLIC ACTIONS: STRESS RESPONSE

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anterior pituitary positive feedback for prolactin

ANTERIOR PITUITARY 

+

PROLACTIN 

MAMMARY GLANDS 

BREAST GROWTH AND MILK SECRETION

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WHAT IS THE GROWTH HORMONE AFFECT ON THE LIVER

GH SECRETED IN THE LIVER

SOMATOMEDIN (PROTEINS)

=BONE GROWTH / SORT TISSUES GROWTH 

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anterior pituitary positive feedback for LH /FSH

ANTERIOR PITUITARY 

+

LUTEINISING HORMONE/ FOLLICLE STIUMULATING HORMONE 

+

OVARIES/TESTES

+

SEX HORMONE SECRETION - ESTROGEN/PROGESTERONE(F)/ PROGESTERONE (M)

GAMETE PRODUCTION - OVARIES/SPERM

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Negative feedback for growth hormone

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Negative feedback for growth hormone

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