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Pituitary G land Posterior Lobe. By: Elena Seifert & Kristen Thorne Period 8 1/8/14. Location. Part of the brain. What type of hormones are produced?. ADH (antidiuretic hormone) Oxytocin . How do these hormones affect the body?. ADH- Promotes reabsorption of water by the kidneys
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Pituitary Gland Posterior Lobe By: Elena Seifert & Kristen Thorne Period 8 1/8/14
Location Part of the brain
What type of hormones are produced? ADH (antidiuretic hormone) Oxytocin
How do these hormones affect the body? • ADH- Promotes reabsorption of water by the kidneys • Oxytocin- strongly affects human social interactions, stimulates uterine contractions during childbirth and facilitates breast feeding • AKA the “love hormone”
Maintenance of homeostasis ADH- helps maintain water and electrolyte balance The pituitary and the hypothalamus glands work together to regulate the release of other hormones in the body.
Feedback Mechanisms ADH- when there is not enough water in the blood ADH is secreted so the kidneys reabsorb water (negative feedback) Oxytocin- during childbirth, oxytocin is released to stimulate uterine contraction and lactation from the mammary glands (positive feedback)
Antagonistic Hormones Vasopressin Receptor Antagonist (VRA)- blocks ADH for those with congestive heart failure Atosiban (oxytocin receptor antagonist)- blocks Oxytocin to control emotions and hormones
Disorders • With a damaged or malfunctioning pituitary gland, your body would lose the normal ability to regulate the hormones released by most endocrine glands. • Disorders of the posterior pituitary gland are: • diabetes insipidus • Syndrome of Inappropriate Antidiuretic Hormone Secretion (SIADH)
Diabetes insipidus • Condition where the kidneys are unable to conserve water due to lack of ADH • Symptoms- • Extreme thirst • Excessive urine volume • Treatment- • Medication (vasopressin)
SIADH • Condition where high levels of ADH cause the kidneys to absorb excessive amounts of water. • Symptoms- • Nausea/vomiting • Cramping • Seizures • Coma • Treatment- • Surgery to remove the gland releasing ADH • Medication to block ADH
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