Which of the following processes is required for normal blood clotting?
Activation of plasmin
Activation of heparin
Adequate levels of potassium
Adequate levels of calcium
The Correct Answer is D
a. Activation of plasmin: Plasmin is involved in breaking down blood clots, not in their formation. It is part of the fibrinolytic system.
b. Activation of heparin: Heparin is an anticoagulant that prevents clotting; it is not required for blood clotting.
c. Adequate levels of potassium: Potassium is important for cellular function but does not play a direct role in blood clotting.
d. Adequate levels of calcium: Calcium ions are essential for various steps in the blood clotting cascade, including the activation of certain clotting factors.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
a. QRS wave: The ECG (electrocardiogram) measures the electrical activity of the heart. The QRS complex represents ventricular depolarization, the spread of electrical excitation through the ventricles causing them to contract.
b. P wave: The P wave represents atrial depolarization, the electrical impulse moving through the atria.
c. T wave: The T wave represents ventricular repolarization, the ventricles relaxing after contraction.
d. U wave: The U wave is a small wave of uncertain origin, not related to ventricular depolarization.
Correct Answer is B
Explanation
a. Stratum granulosum: This layer is composed of keratinocytes that are in the process of dying and forming a barrier of keratin.
b. Stratum basale: This is the deepest layer of the epidermis, where keratinocytes are actively dividing. This layer contains stem cells that produce new keratinocytes to replace those shed from the surface.
c. Stratum lucidum: This layer is only present in thick skin, such as on the palms and soles, and consists of dead keratinocytes that have a translucent appearance.
d. Stratum spinosum: This layer contains keratinocytes that are beginning to produce keratin and other proteins but are not rapidly dividing.
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