Which action is considered a first line of defense?
Lysozyme within tears destroy bacteria.
Chemotaxis attracts phagocytes to the site where the pathogen invaded.
Natural killer cells are the first lymphocytes to react to infection.
Phagocytes ingest microbes when they enter the body.
The Correct Answer is A
A. Lysozyme within tears destroy bacteria.: Lysozyme is an enzyme found in tears that helps to break down the cell walls of bacteria, acting as a chemical barrier and part of the innate immune system's first line of defense.
B. Chemotaxis attracts phagocytes to the site where the pathogen invaded.: This is part of the inflammatory response, which occurs after the first line of defense has been breached; therefore, it is not considered a first line of defense action.
C. Natural killer cells are the first lymphocytes to react to infection.: While natural killer cells play an essential role in the immune response, they are part of the second line of defense and respond after pathogens have entered the body.
D. Phagocytes ingest microbes when they enter the body.: This is part of the second line of defense, as phagocytes respond to pathogens that have breached the first line of defense, which includes physical and chemical barriers.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C, A, D, B
Explanation
- Deoxygenated blood from the body enters the right atrium, passes through the tricuspid valve into the right ventricle.
- From the right ventricle, blood moves through the pulmonary valve into the pulmonary arteries and goes to the lungs for oxygenation.
- Oxygenated blood returns to the left atrium and passes through the bicuspid (mitral) valve into the left ventricle.
- Finally, the left ventricle pumps oxygenated blood through the aortic valve into the aorta for distribution to the body.
Correct Answer is D
Explanation
A. Liver: The liver plays a role in detoxification and metabolism but is not involved in lymphocyte production.
B. Stomach: The stomach is part of the digestive system, not the immune system.
C. Small Intestine: The small intestine is involved in nutrient absorption and contains some lymphoid tissue (Peyer's patches) but is not the main site of lymphocyte production.
D. Thymus: The thymus is the organ where T-lymphocytes mature and are essential for the immune response.
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