Questions: Which lipid class is utilized to transmit signals locally? Steroids Polyunsaturated cis-fatty acid triglycerides Saturated triglycerides Eicosanoids Ketones

The answer is the fourth one: Eicosanoids.

Explanation for each option:

• Steroids: These are a class of lipids that include hormones like testosterone and estrogen. They are involved in a variety of functions, including signaling, but they typically act over longer distances in the body rather than locally.

• Polyunsaturated cis-fatty acid triglycerides: These are a type of fat found in the diet and stored in the body. They are not primarily involved in signaling but rather in energy storage and structural functions.

• Saturated triglycerides: Similar to polyunsaturated triglycerides, these are primarily used for energy storage and are not involved in local signaling.

• Eicosanoids: These are signaling molecules made by the oxidation of 20-carbon fatty acids. They are known for their role in local signaling, particularly in inflammation and immune responses. They include prostaglandins, thromboxanes, and leukotrienes, which act near the site of synthesis.

• Ketones: These are produced during the breakdown of fats and are used as an energy source, especially during fasting or low-carbohydrate diets. They are not involved in local signaling.

In summary, eicosanoids are the lipid class utilized to transmit signals locally, particularly in processes like inflammation and immune responses.