Evaluate the effectiveness of platelet function in a patient with a prolonged bleeding time after a minor injury.
White blood cells are causing excessive clotting.
Platelets are functioning abnormally, leading to impaired clot formation.
The patient has a deficiency in red blood cells.
Plasma proteins are malfunctioning.
The Correct Answer is B
A. White blood cells are causing excessive clotting: White blood cells primarily defend against infection and do not play a direct role in initiating clot formation. Excessive clotting is generally related to platelets or coagulation factors, not WBC activity.
B. Platelets are functioning abnormally, leading to impaired clot formation: Platelets are essential for forming the initial plug at the site of vascular injury. Abnormal platelet function can prolong bleeding time, as the clot forms more slowly or inadequately.
C. The patient has a deficiency in red blood cells: Red blood cells are responsible for oxygen transport and do not directly contribute to clot formation. A deficiency may cause anemia but does not explain prolonged bleeding time.
D. Plasma proteins are malfunctioning: Plasma proteins like clotting factors are important in coagulation, but a prolonged bleeding time after minor injury typically points to platelet dysfunction rather than deficiencies in coagulation proteins, which usually affect clotting time tests instead.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Ball and socket joints: Ball and socket joints, such as the shoulder and hip, allow for a wide range of movement in multiple directions. They are synovial joints with a fluid-filled cavity, not primarily connected by cartilage for limited motion.
B. Synovial joints: Synovial joints have a joint cavity filled with synovial fluid and permit free movement. They include hinge, pivot, and ball-and-socket joints, providing more mobility than partial-movement joints.
C. Cartilaginous joints: Cartilaginous joints are connected by cartilage, allowing limited or partial movement. Examples include intervertebral discs and the pubic symphysis, providing stability while permitting slight flexibility.
D. Fibrous joints: Fibrous joints are connected by dense connective tissue and allow little to no movement. Examples include sutures in the skull, which provide strength and protection rather than flexibility.
Correct Answer is D
Explanation
A. Parasympathetic nervous system: The parasympathetic system promotes “rest and digest” activities, slowing the heart rate, stimulating digestion, and conserving energy. It functions in opposition to the fight-or-flight response.
B. Central nervous system: The central nervous system, consisting of the brain and spinal cord, processes and integrates information but does not directly mediate the autonomic fight-or-flight response. It coordinates signals but relies on the sympathetic system to execute them.
C. Somatic nervous system: The somatic nervous system controls voluntary movements of skeletal muscles. It does not regulate involuntary responses such as increased heart rate, dilation of pupils, or bronchodilation associated with stress.
D. Sympathetic nervous system: The sympathetic nervous system activates the fight-or-flight response by increasing heart rate, dilating airways, redirecting blood flow to muscles, and releasing adrenaline. It prepares the body for rapid, intense physical activity during stress or danger.
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