Which of the following is used to describe the amount of blood ejected from the left ventricle during each contraction?
Cardiac index
Cardiac output
Stroke volume
Ejection fraction
The Correct Answer is C
A. Cardiac index is a measurement of cardiac output adjusted for body surface area. It provides a more individualized assessment of heart function, but it does not describe the amount of blood ejected during each contraction.
B. Cardiac output refers to the total amount of blood the heart pumps in one minute, which is the product of stroke volume and heart rate. However, it describes the overall volume pumped by the heart, not the blood ejected per contraction.
C. Stroke volume is the term used to describe the amount of blood ejected from the left ventricle during each contraction. It is a key indicator of cardiac function.
D. Ejection fraction is the percentage of blood in the left ventricle that is pumped out with each contraction, representing the efficiency of the heart. It is related to stroke volume but is not the same as the volume ejected per contraction.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. The larynx, also known as the voice box, contains the vocal cords. The vocal cords vibrate to produce sound when air passes through them, allowing for speech and other vocalizations.
B. The pharynx is the passageway that connects the mouth and nose to the larynx and esophagus. It does not contain the vocal cords.
C. The trachea is the windpipe that conducts air to and from the lungs. It does not contain the vocal cords but is located just below the larynx.
D. The epiglottis is a flap of tissue that covers the opening of the larynx during swallowing to prevent food from entering the airway. It does not contain the vocal cords
Correct Answer is B
Explanation
A. Magnesium plays a role in many enzymatic reactions and muscle function, but it is not essential for thyroid hormone production.
B. Iodine is an essential element for normal thyroid function. The thyroid gland uses iodine to produce thyroid hormones (T3 and T4), which are critical for regulating metabolism. This is the correct element necessary for thyroid function.
C. Sodium is important for maintaining fluid balance and nerve function, but it is not directly involved in thyroid hormone production.
D. Calcium is important for bone health and cellular processes, but it does not directly influence thyroid hormone synthesis.
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