The Thyroid Gland

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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