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 B
Explanation
A. Dehydration does not directly stimulate the production of erythrocytes. While dehydration can affect blood volume and viscosity, it is not a primary factor in erythropoiesis (the production of red blood cells).
B. Hypoxia (low oxygen levels) stimulates the production of erythropoietin, a hormone produced by the kidneys that promotes the formation of new erythrocytes in the bone marrow. This response helps improve oxygen delivery to tissues.
C. Inflammation triggers the immune response and can affect various blood cell types, but it does not directly stimulate erythropoiesis.
D. Infection can affect blood cell counts, but it is not a direct stimulus for the production of erythrocytes. The body may produce white blood cells as part of the immune response, but not red blood cells specifically.
Correct Answer is B
Explanation
A. Angiotensin does not inhibit thirst; in fact, it stimulates thirst as part of its role in increasing blood pressure and fluid retention.
B. Angiotensin, specifically angiotensin II, stimulates vasoconstriction, which increases blood pressure by narrowing blood vessels. This is one of its primary actions in regulating blood volume and pressure.
C. Angiotensin actually promotes the retention of salt and water in the kidneys to increase blood volume and pressure, rather than stimulating their elimination.
D. Angiotensin does not inhibit antidiuretic hormone (ADH) release; it actually stimulates the release of ADH, which promotes water retention by the kidneys to increase blood volume.
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