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. Hinge joint: Hinge joints allow movement primarily in one plane, such as flexion and extension, like the elbow or knee, limiting rotation and side-to-side motion.
B. Saddle joint: Saddle joints permit movement in two planes, such as flexion-extension and abduction-adduction, but do not allow full rotational movement.
C. Ball and socket joint: Ball and socket joints, like the shoulder and hip, have a spherical head fitting into a cup-like cavity, allowing multiaxial movement including flexion, extension, abduction, adduction, and rotation.
D. Pivot joint: Pivot joints allow rotational movement around a single axis, such as the atlantoaxial joint, but do not permit flexion or abduction.
Correct Answer is C
Explanation
A. Photoreceptors: Photoreceptors are specialized cells in the retina that detect light and color, playing a role in vision. They do not respond to temperature changes.
B. Chemoreceptors: Chemoreceptors detect chemical changes in the environment or body, such as oxygen, carbon dioxide, and pH levels. They are not involved in sensing temperature.
C. Thermoreceptors: Thermoreceptors are sensory receptors located in the skin and hypothalamus that respond to changes in temperature. They allow the body to perceive warmth and cold and help regulate thermoregulation.
D. Mechanoreceptors: Mechanoreceptors respond to mechanical stimuli such as pressure, touch, vibration, and stretch. They do not detect temperature changes.
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