Evaluate your knowledge of the chemical classes of hormones by classifying the s

Question

Evaluate your knowledge of the chemical classes of hormones by classifying the statements shown at left as being descriptive of peptides/catecholamines or steroids/thyroid hormone shown at right. Peptides/Catecholamines Steroids/Thyroid Hormone Require protein carriers to be transported in the blood plasma Secretion occurs via exocytosis of pre-packaged vesicles upon stimulation Receptor site is inside target cells usually in the nuclei Receptor site is usually the plasma membrane of target cells Synthesized by modifications of cholesterol or tyrosine Hydrophobic/lipophilic Usually have a slow effect and are metabolized and Hydrophilic/lipophobic excreted slowly Are membrane permeable so Packaged into secretory vesicles the rate of secretion usuallyby the Golgi apparatus and many equals the rate of synthesis are stored as prohormones Initiate second-messenger signaling cascades or enzymatic activation by the receptor Transported freely dissolved in the blood plasma Usually have a fast effect and Cannot be stored in vesicles are metabolized and excreted quickly must be stored in colloid or synthesized upon stimulation Synthesized in endoplasmic reticulum and Golgi apparatus Initiate changes in gene transcription

Explanation / Answer

Peptides/cathecholamines

Steroids/thyroid hormone

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