Which of the following statements about the immune system is/are true?Question 2Select one or more:a.Phagocytosis is the process by which certain cells, such as macrophages and neutrophils, engulf and digest foreign particles, bacteria, and dead or dying cells.b.Adaptive immunity is faster-acting than innate immunity.c.The immune system uses chemokines to attract cells such as neutrophils.d.Immune cells can communicate with each other by binding to receptors on each other’s surfaces.e.The immune system uses cytokines for communication over short distances.

Which of the following statements about the immune system is/are true?Question 15Select one or more:a.Moderate exercise decreases numbers of circulating neutrophils, monocytes and natural killer cells.b.The immune system uses chemokines to attract cells such as neutrophils.c.Immune cells can communicate with each other by binding to receptors on each other’s surfaces.d.The immune system uses cytokines for communication over short distances.e.Adaptive immunity is slower-acting than innate immunity.

Which of the following statements about phagocytes is TRUE?Select one alternative:Macrophages can undertake repeated phagocytosisPus is formed predominantly from dead macrophagesNeutrophils require activation before they are effectiveNeutrophils are long living cells

Which comparison would best support the idea presented in this paragraph?Through the process of phagocytosis, specialized cells in the immune system engulf and destroy unwanted microorganisms in the blood. This serves to remove foreign bodies and fight infection. These cells, called phagocytes, first surround the microorganisms and then begin a series of chemical reactions that break them down.A.Much like the process of digestion, the phagocytes "eat" and then digest the unwanted organisms.B.Acting like a cargo transport, the phagocytes move the unwanted organisms out of the body.C.The phagocytes act as tour guides, showing microorganisms where they need to reside.D.As if in a war, the phagocytes battle the microorganisms for control of the immune system.

Which of the statements below describe an example of innate immunity?Choose ALL correct responses Question 3Select one or more:a.Mast cell activation and the release of inflammatory mediatorsb.Dendritic cells engulfing and digesting a pathogen and migrating to the lymph nodec.Complement activation by IgG antibodies bound to the surface of a bacteriumd.Production of IgE antibodies specific for helminth proteins by B cellse.Trapping and removal of bacteria by mucus and cilia in the respiratory tractf.Killing of a virus infected cell by cytotoxic T cells

True/False: The immune system is the only system that protects the body from diseases