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3 
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B and T cells are this type of immune cell 
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5 
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Where leukocytes are produced 
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6 
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Released by phagocytes to communicate further immune responses in the brain 
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7 
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A type of phagocyte that engulfs invading pathogens  
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8 
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Your bodies built-in cellular defense 
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11 
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Also called immunoglobulins, these proteins lock onto specific antigens of invading pathogens.  . 
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13 
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A result of immune cells releasing histamines, causing the blood vessels to swell. 
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16 
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A collection of dead phagocytes as a result of 'overworking' them at the site of an infection 
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17 
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The skin and mucous membrane are examples of this type of barrier 
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18 
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Type of immunity that is 'borrowed' from a source for a short time (eg. antibodies from mothers breast milk) 
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1 
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Lysozymes in tears and stomach acid are examples of this type of barrier 
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2 
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An antimicrobial enzyme found in your tears 
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4 
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Part of innate defence, this wet layer that lines your nose, mouth and other openings traps pathogens in it. 
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9 
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The first line of defense against pathogens.  It is non-specific and includes physical, chemical and cellular barriers. 
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10 
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You develop this type of immunity throughout your life by getting exposed to disease and being vaccinated 
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12 
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Macrophages, neutrophils, basophils and dendritic cells are this type of WBC. 
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14 
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A different name for white blood cell. 
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15 
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A type of phagocyte that targets bacteria 
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