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.
Lymph nodes from your neck down to your groin are key to helping your body fight off illnesses. Swollen lymph nodes tell you something is wrong. So what could be the cause of swollen lymph nodes in the neck? The most common cause is an infection, especially a viral infection, such as a cold, says the Mayo Clinic in Rochester, Minn. The clinic also provides the following causes. Medical conditions such as lupus, rheumatoid arthritis and cancer can cause swollen lymph nodes as well.