Grease

Grease is a general term used to describe a group of oily or fatty substances. It is commonly used in cooking, machinery, and industrial applications. In a biological context, grease can also refer to the sebaceous secretion of the skin, which helps to waterproof and protect the skin.

Chemical Composition

Most greases are composed of a base oil and a thickening agent. The base oil can be mineral oil, synthetic oil, or a combination of both. The thickening agent is typically a metal soap, such as lithium, aluminum, or calcium soap. Other additives, such as antioxidants and corrosion inhibitors, may also be included to enhance the performance of the grease.

Biological Importance

In biological systems, grease refers to the sebaceous secretion produced by sebaceous glands in the skin. This grease, known as sebum, helps to lubricate and waterproof the skin and hair. It also contains fatty acids that have antimicrobial properties, helping to protect the skin from infections.

Study Guide

• What is the chemical composition of grease?
• How is grease used in cooking and industrial applications?
• What is the biological significance of grease in the context of skin health?
• What are the components of sebum and how do they contribute to skin health?
• How do sebaceous glands contribute to the production of grease in the skin?