Which term describes a fatty phospholipid substance?

The term that describes a fatty phospholipid substance is lecithin. Lecithin is a complex mixture of phospholipids, primarily phosphatidylcholine, and is found in many biological tissues. It plays a crucial role in cellular membrane structure as it helps to maintain the integrity and fluidity of cell membranes. Additionally, lecithin acts as an emulsifier, facilitating the mixing of fats and water, which is essential in various biological processes and food applications.

In contrast, lactate is the salt or ester of lactic acid, primarily involved in anaerobic metabolism. Ligaments are tough, fibrous tissues that connect bones to each other, primarily providing stability in joints, while lymph is a fluid that is part of the lymphatic system, responsible for transporting immune cells and other substances. These terms do not refer to a fatty phospholipid substance, highlighting the unique role and characteristics of lecithin in the context of biochemistry.