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Questions and Answers
What is the source of eicosanoids?
What is the source of eicosanoids?
- 20 carbon polyunsaturated fatty acids (correct)
- 22 carbon polyunsaturated fatty acids
- 18 carbon polyunsaturated fatty acids
- 25 carbon polyunsaturated fatty acids
What do eicosanoids function as in the body?
What do eicosanoids function as in the body?
- Systemic hormones
- Enzymes
- Local hormones (correct)
- Neurotransmitters
What is a characteristic of eicosanoids in terms of their action?
What is a characteristic of eicosanoids in terms of their action?
- Systemic effects
- Long-term effects
- Hormonal effects
- Discrete and tissue-specific effects (correct)
Which of the following is NOT a type of eicosanoid?
Which of the following is NOT a type of eicosanoid?
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What is the effect of eicosanoids on the digestive system?
What is the effect of eicosanoids on the digestive system?
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When do eicosanoid levels increase?
When do eicosanoid levels increase?
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Study Notes
Eicosanoids
- Eicosanoids are a family of biologically active substances derived from 20 carbon polyunsaturated fatty acids, such as arachidonic acid.
- Members of the eicosanoid family include prostaglandins, thromboxanes, leukotrienes, and epoxy-eicosatrienoic acids (EETs).
- Eicosanoids function as local hormones, synthesized and exerting their biological actions in the same tissue.
- They have physiological and pathological effects on various systems, including:
- Cardiovascular system
- Pulmonary system
- Reproductive system
- Digestive system
- Examples of their effects include:
- Inducing abortion or pregnancy ulcers
- Site-specific actions during shock and after injury
- Diverse functions, such as:
- Bronchoconstriction
- Bronchodilation
- Vasodilation
- Vasoconstriction
- Physiologically and pathologically, eicosanoids are local hormones, synthesized and exerting their action in a tissue, with actions usually discrete and related to the physiological demands of the tissue.
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