{{model.addEditText}} Print. 1  Prep. 10 m. 2  Cook. 6 h. 3  Ready In. 6 h 10 4  m. Whisk together the water, Italian dressing mix, ranch dressing mix, and brown gravy mix together in a bowl until smooth. Place the beef roast into a slow cooker, and pour the sauce over top.  Cook on Low until the roast is easily pierced by a fork, 6 to 8 hours.
The immune system, which is made up of special cells, proteins, tissues, and organs, defends people against germs and microorganisms every day.The immune system is a network of cells, tissues, and organs that work together to defend the body against attacks by âforeignâ invaders.Organs of immune system: tonsils and adenoids, lymph nodes, lymphatic vessels, thymus, spleen, appendix and bone marrow.Bone marrow, the soft tissue in the hollow center of bones, is the ultimate source of all blood cells, including lymphocytes.he immune system, which is made up of special cells, proteins, tissues, and organs, defends people against germs and microorganisms every day.
The immune system is made up of antibodies, white blood cells, and other chemicals and proteins that attack and destroy substances such as bacteria and viruses that they recognize as foreign and different from the body's normal healthy tissues. The immune system also includes: 1  The tonsils and thymus, which make antibodies. 2  The lymph nodes and vessels (the lymphatic system). This network of lymph nodes and vessels throughout the body carries lymph fluid, nutrients, and waste material between the body tissues and the bloodstream. 3  Bone marrow.