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Hormones That Affect Metabolism Gland Thyroid Parathyroid Anterior Pituitary Gland Hormone Action Hormones That Affect Metabolism Gland Hormone Action Thyroid Thyroxine metabolism Calcitonin ↓’s calcium levels in blood Parathyroid PTH ↑’s calcium levels in blood Anterior Pituitary Gland GH Growth of bones and soft tissue Thyroid Gland and Negative Feedback • Type in “Biology in Motion” and click on Thyroid Gland and Negative Feedback • Go through animations and make notes on: • A) Stimulation of the Thyroid Gland • B) Regulation of the Thyroid Gland • C) Goiter and it’s Prevention Feedback Control Loops for Thyroid Hormones Thyroid Gland • • • • Hyperthyroidism ↑ thyroxine ↑ metabolism No weight gain • • • • Hypothyroidism ↓ thyroxine ↓ metabolism Weight gain Parathyroid Glands • 4 small glands inside the thyroid • Produce PTH Endocrine System Control Feedback Regulation of Blood Calcium calcitonin kidney reabsorption of Ca++ thyroid high blood calcium level Ca++ uptake in intestines (10 mg/100mL) low activated Vitamin D bones release Ca++ kidney reabsorption of Ca++ parathyroid parathyroid hormone (PTH) Ca++ deposited in bones Growth Hormone • ↓ GH Dwarfism • ↑ GH Gigantism • GH affects all body cells BUT mainly bone cells • Acromegaly- bones of jaw, forehead, fingers and toes increase in width, once other bones can no longer increase in length (growth plates fused)