Which of the following are characteristics of conservation in school-aged children? (Select All that Apply.)
Thinking that cutting a sandwich into more pieces means there is more food
Believing that pouring water from a short, wide cup into a tall, narrow cup increases the amount of water
Understanding that the amount of a substance remains the same even if its appearance changes
Recognizing that a ball of clay can be flattened and rolled back into a ball without changing its amount
Believing that a taller, narrower glass contains more liquid than a shorter, wider glass
Correct Answer : C,D
A. This reflects a lack of understanding of conservation, as cutting a sandwich does not increase the quantity of food.
B. This belief shows a misunderstanding of conservation, where children may not recognize that the volume remains constant regardless of the container's shape.
C. Understanding that the amount of a substance remains the same even if its appearance changes is a key characteristic of conservation.
D. Recognizing that a ball of clay can be flattened and rolled back into a ball without changing its amount also demonstrates an understanding of conservation.
E. This belief indicates a misunderstanding of conservation, as the amount of liquid does not change based on the height or width of the container.
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Correct Answer is A
Explanation
A. Distributive shock, particularly in the context of anaphylaxis, is characterized by widespread vasodilation that leads to a decrease in systemic vascular resistance and impaired blood flow to organs despite normal or increased cardiac output.
B. This option is incorrect because distributive shock involves decreased systemic vascular resistance due to vasodilation rather than an increase.
C. This statement describes hypovolemic shock, not distributive shock. Distributive shock is not primarily caused by the loss of blood volume.
D. While loss of myocardial contractility can lead to cardiogenic shock, it is not the mechanism behind distributive shock, which is related to vascular tone rather than heart function.
Correct Answer is B
Explanation
A. Tricuspid atresia typically leads to decreased pulmonary blood flow due to the absence of normal blood flow to the lungs.
B. Patent ductus arteriosus results in increased pulmonary blood flow because it allows blood to flow from the aorta to the pulmonary artery, increasing the volume of blood going to the lungs.
C. Coarctation of the aorta can cause decreased blood flow to the lower body, which may not directly relate to increased pulmonary blood flow.
D. Tetralogy of Fallot is characterized by decreased pulmonary blood flow due to right ventricular outflow obstruction, making it not associated with increased pulmonary blood flow.