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.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Epididymis: The epididymis is where sperm mature and are stored. It is not cut during a vasectomy.
B. Tunica albuginea: This is the connective tissue surrounding the testis, not part of the sperm-carrying duct system.
C. Efferent ductules: These ducts transport sperm from the testis to the epididymis, but they are not cut during a vasectomy.
D. Ductus deferens: The ductus deferens (vas deferens) is the tube that carries sperm from the epididymis to the ejaculatory duct. It is cut and sealed during a vasectomy, preventing sperm from reaching the urethra.
Correct Answer is B
Explanation
A. Gastrin: Gastrin stimulates gastric acid secretion in the stomach, not pancreatic bicarbonate.
B. Secretin: Secretin stimulates the pancreas to secrete bicarbonate, which neutralizes stomach acid in the duodenum.
C. Somatostatin: Somatostatin inhibits many digestive processes, including the release of digestive hormones, not bicarbonate.
D. Cholecystokinin (CCK): CCK stimulates the release of digestive enzymes from the pancreas but not bicarbonate.
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