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.
Possible Causes of Swollen Lymph Nodes behind the Ear. The lymph nodes are sensitive to changes in the body, most notably new tissues or particles that agitate the immune system. Listed below are some of the most common causes for swollen lymph nodes behind the left ear. Infections- Infections which enlarge the lymph nodes can be bacterial, viral or fungal. When the body suffers an infection, the cells start to produce antibodies to fight it off.