An example of a positive feedback mechanism is
blood calcium level regulation
body temperature regulation
regulating glucose levels in the blood
enhancement of labor contractions
The Correct Answer is D
A. Blood calcium level regulation: Regulation of calcium levels in the blood is typically controlled by negative feedback mechanisms involving the parathyroid hormone and calcitonin, which restore levels to a set point.
B. Body temperature regulation: Body temperature is maintained through negative feedback, where sensors detect deviations and initiate responses such as sweating or shivering to return the temperature to normal.
C. Regulating glucose levels in the blood: Blood glucose is regulated by negative feedback via insulin and glucagon, which act to decrease or increase glucose levels as needed to maintain homeostasis.
D. Enhancement of labor contractions: During childbirth, oxytocin stimulates stronger uterine contractions, which in turn cause more oxytocin to be released. This amplifying loop is an example of positive feedback, where the response intensifies the original stimulus.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Sagittal: A sagittal plane divides the body into left and right portions, either equally or unequally, but does not separate anterior and posterior regions.
B. Frontal: The frontal (or coronal) plane is a vertical plane that divides the body into anterior (front) and posterior (back) sections, making it the correct choice.
C. Median: The median (midsagittal) plane is a specific sagittal plane that passes exactly through the midline, dividing the body into equal left and right halves, not front and back.
D. Transverse: The transverse (horizontal) plane divides the body into superior (top) and inferior (bottom) portions, not anterior and posterior.
Correct Answer is C
Explanation
A. Hand: Veins in the hand, such as the dorsal venous network, can be used for blood draws, but the median cubital vein is not located there.
B. Lateral side of the foot: The veins in the foot are rarely used for routine blood draws due to accessibility and risk of complications; the median cubital vein is not found here.
C. Anterior side of the elbow: The median cubital vein is a prominent superficial vein located in the antecubital fossa on the anterior aspect of the elbow. It is commonly used for venipuncture due to its size, accessibility, and relatively stable position.
D. Proximal arm: While veins in the upper arm exist, the median cubital vein is specifically located in the anterior elbow region, not the proximal upper arm.
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