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The Thyroid Gland - • Bound to receptors activating genes...

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The Thyroid Gland The thyroid • Lies near the thyroid cartilage of the larynx • Two lobes connected by an isthmus Thyroid follicles and thyroid hormones • Thyroid gland contains numerous follicles • Release several hormones such as thyroxine (T4) and triiodothyronine (T3) • Thyroid hormones end up attached to thyroid binding globulins (TBG) • Some are attached to transthyretin or albumin   Thyroid hormones • Held in storage • Bound to mitochondria, thereby increasing ATP production
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Unformatted text preview: • Bound to receptors activating genes that control energy utilization • Exert a calorigenic effect Cells of the thyroid gland • C cells produce calcitonin • Helps regulate calcium concentration in body fluids The Parathyroid Glands Four parathyroid glands • Embedded in the posterior surface of the thyroid gland • Chief cells produce parathyroid hormone (PTH) in response to lower than normal calcium concentrations • Parathyroid hormones plus calcitriol are primary regulators of calcium levels in healthy adults...
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