By Anne Marie Helmenstine, Ph.D. Lipids are a diverse group of fat-soluble biological molecules. Here is a look at different types of lipids and where they are found.1  Triacylglycerols or Triglycerides. 2  The largest class of lipids goes by different names: triacylglycerols, triglycerides, glycerolipids, or fats.y Anne Marie Helmenstine, Ph.D. Lipids are a diverse group of fat-soluble biological molecules. Here is a look at different types of lipids and where they are found.
Lymph nodes become swollen in response to illness, infection, or stress. Swollen lymph nodes are one sign that your lymphatic system is working to rid your body of the responsible agents. Swollen lymph glands in the head and neck are normally caused by illnesses such as: 1  ear infection.
Whatâs the Most Common Cause of Swollen Glands? An infection, especially a viral infection such as the common cold, is the most common cause of swollen lymph nodes. Strep throat and mononucleosis also commonly produce swollen nodes. Both bacterial and viral infections can cause lymph nodes to swell, and it doesnât have to be an upper respiratory infection--ear infections, skin and wound infections, and tooth abscesses are all common infections leading to swollen lymph nodes.