A patient is found to have a deficiency in clotting factors. Which blood component is primarily responsible for clot formation?
Plasma proteins
Red blood cells
Platelets
White blood cells
The Correct Answer is C
A. Plasma proteins: Plasma contains clotting (coagulation) proteins such as fibrinogen and other clotting factors that are essential to the coagulation cascade, but they require cellular elements to form a stable clot.
B. Red blood cells: Red blood cells are not responsible for initiating clot formation; they become trapped in the fibrin mesh of a clot but do not drive clotting.
C. Platelets: Platelets (thrombocytes) adhere to damaged endothelium, aggregate, and provide a phospholipid surface for coagulation enzyme complexes, playing a primary role in clot formation.
D. White blood cells: White blood cells participate in immune responses and inflammation but are not the primary cellular drivers of clot formation.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. An increase in hormone levels leads to an increase in secretion of that hormone.:This describes positive feedback rather than negative feedback.
B. Hormone levels remain constant regardless of bodily needs.:Hormone secretion changes in response to physiological needs; negative feedback maintains homeostasis rather than absolute constancy.
C. Hormone secretion is regulated by conscious thought.:Hormone secretion is largely autonomic and homeostatic, not under conscious voluntary control.
D. A decrease in hormone levels triggers an increase in secretion of that hormone.:Negative feedback works by sensing low levels of a hormone (or its effect) and increasing secretion to restore balance.
Correct Answer is A
Explanation
A. Filtering lymph and housing lymphocytes:Lymph nodes filter lymph fluid to remove pathogens and debris and contain lymphocytes (B and T cells) and antigen-presenting cells that participate in immune responses.
B. Producing red blood cells:Red blood cell production occurs primarily in the bone marrow, not in lymph nodes.
C. Facilitating nutrient absorption:Nutrient absorption (notably fat absorption) occurs in the small intestine, particularly the villi and lacteals, rather than in lymph nodes.
D. Transporting oxygen:Oxygen transport is performed by red blood cells in the bloodstream, not by lymph nodes.
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