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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. The medulla oblongata, located in the brainstem, is directly responsible for controlling the rate and depth of breathing. It detects changes in blood levels of CO2 and adjusts respiratory activity accordingly.
B. The hypothalamus regulates various autonomic functions, including body temperature, hunger, and thirst, but it is not directly involved in the control of respiration.
C. The midbrain is involved in functions such as vision, hearing, and motor control, but it does not directly control respiration.
D. The cerebellum is responsible for coordinating movement and balance, but it does not regulate respiratory control.
Correct Answer is C
Explanation
A. Elastin is a protein found in connective tissue that provides elasticity, allowing the skin and other tissues to return to their original shape after stretching. It does not influence skin color.
B. Hemoglobin is the oxygen-carrying component of red blood cells. It gives the skin a reddish tint due to blood flow, but it is not the primary determinant of overall skin color.
C. Melanin is the pigment produced by melanocytes in the skin. The type and amount of melanin determine the color of an individual's skin, with darker skin having more melanin.
D. Keratin is a structural protein found in the skin, hair, and nails, providing strength and protection. While it contributes to the skin's texture and appearance, it does not determine skin color.
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