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 help your body fight infection by producing lymph, a fluid that travels throughout your body and filters impurities such as bacteria and abnormal cells. There are a number of reasons why a lymph node may become swollen, including infection, inflammation and lymphoma.Infection is the most common.ymph nodes help your body fight infection by producing lymph, a fluid that travels throughout your body and filters impurities such as bacteria and abnormal cells. There are a number of reasons why a lymph node may become swollen, including infection, inflammation and lymphoma.