Endocrine System: Biochemistry, Secretion and Transport of Hormones

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Endocrine System: Biochemistry, Secretion and Transport of Hormones

By | June 2013
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Endocrine System: Biochemistry, Secretion and Transport of Hormones

1.Place the following hormones into one of the three categories of hormones (peptides, amines or steroids): T4 (thyroxin), estradiol, norepinephrine, insulin, aldosterone, glucagon, cortisol, growth hormone, T3 (triiodothyronine), epinephrine, testosterone and vasopressin (ADH). |Peptides |Amines |Steroids | |Insulin |T4 (thyroxine) |Estradiol | |glucagon |norepinephrine |aldosterone | |growth hormone |T3 |cortisol | |vasopressin (ADH) |epinephrine |Testosterone |

2.Peptide hormones are synthesized as large precursor hormones called preprohormones. The hormones (or prohormones) are stored in Secretory vesicles and released from the cell by exocytosis. Do peptide hormones require a carrier in the blood stream? Its hydrophilic which requires no carrier. 3.Catecholemines are produced in the medulla of the adrenal gland and are classified as amine hormones since they are derived from tyrosine. Stimulation of the chromaffin cells causes an influx of calcium ions, which causes the vesicles to merge with the plasma membrane and release the hormone by exocytosis. Are catecholemines water-soluble or lipid-soluble? Its hydrophilic which requires no carrier. 4.Thyroid hormones include two molecules called T3 and T4. T3 consists of two tyrosine molecules plus 3 iodine molecules and is less abundant than T4. Are carriers required for the transport of thyroid hormones? It is lipophilic which requires a carrier 5.All...

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