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Number 1. also known as the flu, is a contagious respiratory infection caused by different influenza viruses

Correct Answer: influenza

Number 2. Nonspecific defense mechanisms that come into play immediately or within hours of an antigen's appearance in the body. These mechanisms include physical barriers such as skin, chemical barriers, and immune system cells that attack foreign cells in the body.

Correct Answer: innate immune system

Number 3. Specific immune defense composed of lymphocytes producing antibodies and memory cells for eliminating pathogens or preventing their growth. This is also known as acquired and specific immune system.

Correct Answer: adaptive immune system

Number 4. Occurs when an antigen comes in contact to the immune system for the first time.

Correct Answer: primary response

Number 5. Occurs the second time (3rd, 4th, etc.) a person comes into contact to the same antigen; produces antibodies much faster because the memory cells, having been established during the primary response, are present and able to immediately start releasing those pathogen-specific antibodies for defense.

Correct Answer: secondary response

Number 6. carried out by T cells when the pathogen is inside the body cells

Correct Answer: cell-mediated immune response

Number 7. is controlled by activated B cells and antibodies; antibodies circulating in the blood as a mode of action for destroying pathogens

Correct Answer: humoral immune response

Number 8. outside cell

Correct Answer: extracellular

Number 9. inside cell

Correct Answer: intracellular