1. Which of the following CORRECTLY describes the flow of lymph? (a) Subclavian
ID: 3521642 • Letter: 1
Question
1. Which of the following CORRECTLY describes the flow of lymph? (a) Subclavian vein, Collecting duct, Lymphatic trunk, Lymphatic vessel, b) Lymphatic capillary, Lymphatic vessel, Lymphatic trunk, Collecting duct (c) Lymphatic vessel, Lymphatic capillary, Subclavian vein, Collecting duct, d) Collecting duct, Lymphatic trunk, Lymphatic vessel, Lymphatic capillary, Lymphatic capillary Subclavian vein Lymphatic trunk Subclavian vein 2. The body has several types of innate (nonspecific) defenses that it uses to protect itself from harmful pathogens. Which of the following definitions below correctly describes chemical barriers, a type of innate defense? (a) A species is resistant to certain diseases to which other species are susceptible b) Enzymes, pH extremes and high salt concentrations, and interferons harm pathogens (c) Unbroken skin and mucous membranes prevent the entrance of infectious agents d) Neutrophils and macrophages engulf and destroy foreign particles 3. Which of the following types of cells can directly kill cells and secretes a chemical known as perforin which accomplishes the killing by producing pore- like openings in the membranes of cells?Explanation / Answer
1) b . lymph vessels empty into the lymphatic ducts which drain into subclavian veins
2)c . innate immunity is the immunity provided by skin. mucous membrane etc while the entry of infective organisms.
3)Natural killer cells . Natural killer cells secrets perforin.
4)false . helper t cells are are most importanat cells in adaptive immunity . they help to activate beta cells to produce antibodies and macrophages to destroy ingested microbes.they also help to activate cytotoxic T cells to kill infected target cells.
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