Compare the four chemical classes of hormones with reference to hormones within each class.
To review:
Comparison of four chemical classes of hormones.
Introduction-:
Hormones are the molecules that are produced and secreted into the bloodstream by endocrine glands. These molecules are then taken by the blood stream to target cells where they carry out their actions. Endocrine glands are derived from the epithelial tissues and are ductless unlike exocrine glands.
Explanation of Solution
Based on the difference in chemical structure, hormones have been classified into four major classes:
1. Amines: These hormones are derived from amino acids namely tyrosine and tryptophan. Examples are the hormones released by adrenal medulla, thyroid, and pineal glands.
2. Polypeptides and proteins: These hormones consist of polypeptide chains (chain of amino acids). If the polypeptide chain has less than 100 amino acids, it is called polypeptide. Example is oxytocin. But if it has more than 100 amino acids like in case of growth hormone, it is called proteins.
3. Glycoproteins: In this, protein molecule is attached to one or more carbohydrate groups. Examples are follicle stimulating hormones (FSH).
4. Steroids: These hormones are derived from cholesterol. An enzyme is responsible for cleaving off the side chain which is attached to five-carbon ‘D’ ring in cholesterol molecule to form steroid hormones. Examples are estradiol, testosterone, and progesterone.
Following is the comparison of four classes of hormones:
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Chapter 11 Solutions
Human Physiology
- What are “antagonistic” hormones? Provide an example.arrow_forwardDiscuss the chemical composition of hormones and the mechanisms of hormone actionarrow_forwardList the major chemical classes of hormones found in the human body. Compare and contrast the mechanism of response that each class elicitsarrow_forward
- Name the types of chemical makeup possible for hormones and the types of hormone receptos.arrow_forwardOutline hormone classification based upon chemicalstructure.arrow_forwardContrast the major structural classes of hormones, and explain the general processes and effects of hormone action on target organs.arrow_forward
- Human Physiology: From Cells to Systems (MindTap ...BiologyISBN:9781285866932Author:Lauralee SherwoodPublisher:Cengage Learning