Which of the following is a characteristic of a phagocyte?
Clumping together and adhering to damaged tissues
Digesting foreign pathogens in damaged tissues
Entering damaged tissues and releasing histamine
Transporting oxygen from the lungs to damaged tissues
The Correct Answer is B
A. While phagocytes can move to areas of damage, their primary function is not to clump together and adhere to tissues, but rather to engulf and digest foreign materials.
B. Phagocytes, such as macrophages and neutrophils, are specialized white blood cells that ingest and digest foreign pathogens, dead cells, and debris within damaged tissues. This is their main characteristic and function.
C. The release of histamine is typically associated with mast cells, not phagocytes. Histamine helps to initiate inflammatory responses, but phagocytes are involved in engulfing pathogens rather than releasing histamine.
D. Transporting oxygen from the lungs to tissues is the role of red blood cells, not phagocytes. Phagocytes are involved in immune defense, not oxygen transport.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. The superior and inferior vena cava carry deoxygenated blood from the body to the right atrium, not oxygenated blood to the left atrium.
B. The aorta carries oxygenated blood away from the left ventricle to the rest of the body but does not return it to the heart.
C. The pulmonary arteries transport deoxygenated blood from the right ventricle to the lungs for oxygenation, not the other way around.
D. The pulmonary veins are responsible for transporting oxygenated blood from the lungs to the left atrium, completing the pulmonary circulation.
Correct Answer is B
Explanation
A. The trachea is the windpipe that carries air to the lungs. While it plays a role in respiration, it does not protect the airway during swallowing.
B. The epiglottis is a flap of cartilage that covers the trachea during swallowing, preventing food or liquid from entering the airway and directing it to the esophagus.
C. The uvula is part of the soft palate that helps in the swallowing process but does not directly protect the airway. It assists in preventing food from entering the nasal cavity.
D. The pharynx is the passageway for both air and food, but it does not provide protection to the airway during swallowing. The epiglottis is the main structure responsible for this protection.
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