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Thyroidism notes Campbell biology 9th edition

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Subject: 
Biology
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Endocrine system
Anatomy
Peptide hormones
Glands
Thyroid
Endocrinology
Hormone
Adrenal gland
Parathyroid gland
Parathyroid hormone
Insulin
Glucagon

? 2012 Pearson Education, Inc. The Thyroid Gland ? Lies anterior to thyroid cartilage of larynx ? Consists of two lobes connected by narrow isthmus ? Thyroid follicles ? Hollow spheres lined by cuboidal epithelium ? Cells surround follicle cavity that contains viscous colloid ? Surrounded by network of capillaries that ? deliver nutrients and regulatory hormones ? accept secretory products and metabolic wastes Figure 18-10 ? 2012 Pearson Education, Inc. The Thyroid Gland: Thyroid hormones ? Thyroglobulin (Globular Protein) ? Synthesized by follicle cells ? Secreted into colloid of thyroid follicles ? Molecules contain the amino acid tyrosine ? Thyroxine (T4) ? ?pro-hormone? ? Also called tetraiodothyronine

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