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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Related Questions
Correct Answer is C
Explanation
A. The renal afferent arteriole does not play a role in reabsorbing glucose. Glucose reabsorption occurs in the proximal convoluted tubule of the nephron, not in the afferent arteriole.
B. The afferent arteriole does not reabsorb potassium and magnesium. These electrolytes are reabsorbed in specific segments of the nephron, such as the proximal convoluted tubule and the loop of Henle.
C. The renal afferent arteriole delivers blood to the nephron, specifically to the glomerulus, where filtration of blood occurs. This is its primary function in the kidney's filtration process.
D. The afferent arteriole does not act as a holding area for filtrate. Filtrate is formed in the glomerulus, and it then moves into the Bowman's capsule and through the nephron.
Correct Answer is C
Explanation
A. GABA (gamma-aminobutyric acid) is an inhibitory neurotransmitter in the central nervous system, meaning it generally reduces neuronal excitability and does not play a role in excitatory neuromuscular transmission.
B. Glycine is also an inhibitory neurotransmitter, mainly in the spinal cord, and works to prevent over-excitation of neurons, not directly involved in neuromuscular transmission.
C. Acetylcholine is the primary neurotransmitter responsible for neuromuscular transmission. It binds to receptors on muscle cells, causing depolarization and triggering muscle contraction, thus playing an excitatory role.
D. Serotonin primarily functions in the brain to regulate mood, appetite, and sleep but does not play a direct role in neuromuscular transmission.
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