Questions and Answers
What does 'lipophobic' mean?
Lipophobic substances are typically bound to a transport protein in blood.
False
Where are lipophobic receptors found?
On cell membrane surfaces of target cells
Target cells generate a quick response when interacting with lipophobic substances.
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Which of the following substances is lipophobic?
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What effect do lipophilic substances have on target cells?
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Lipophilic substances have a relatively short half-life in circulation.
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How do lipophilic substances affect the response time of target cells?
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Which of the following substances is lipophilic?
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Study Notes
Lipophobic Characteristics
- Lipophobic substances cannot diffuse through the cell membranes of target cells.
- Typically, they are not bound to transport proteins in the bloodstream, making them less soluble in lipids.
- Their receptors are located on the surfaces of target cell membranes, facilitating rapid signal transduction.
- The response generated in target cells occurs quickly, ranging from seconds to several minutes.
- Key examples of lipophobic substances include hormones like dopamine, prolactin, somatotropin, and epinephrine.
Lipophilic Characteristics
- Lipophilic substances stimulate genomic effects within target cells, influencing gene expression.
- They have the ability to activate gene expression, leading to long-lasting changes in target cells.
- Lipophilic compounds generally exhibit a relatively long half-life in circulation compared to lipophobic substances.
- The response time in target cells is slow, often taking hours to manifest.
- Notable examples of lipophilic substances include hormones such as progesterone, T4 (thyroxine), T3 (triiodothyronine), and testosterone.
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Description
Test your understanding of lipophobic and lipophilic properties with this quiz. You'll learn about their definitions, cellular interactions, and the significance of transport proteins. Perfect for students studying biology or biochemistry.
