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.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. The number of hair follicles does not increase with age. In fact, there is a gradual decrease in the number of hair follicles as one ages.
B. Decreased sebum production is a common skin change associated with aging. Sebum helps keep the skin moisturized, and as its production decreases with age, the skin tends to become drier.
C. Skin elasticity actually decreases with age due to the breakdown of collagen and elastin fibers, leading to wrinkles and sagging.
D. Epidermal permeability tends to increase with age, as the skin becomes thinner and more fragile, making it easier for substances to pass through.
Correct Answer is C
Explanation
A. The primary follicle is an earlier stage in the development of the ovarian follicle, not the structure that forms after ovulation.
B. The zygote is the result of fertilization, formed when the sperm and egg unite, but it does not form from the follicle after ovulation.
C. The corpus luteum forms from the remains of the follicle after ovulation. It secretes progesterone to support early pregnancy or prepares to degenerate if pregnancy does not occur.
D. The oocyte is the egg cell itself, which is released during ovulation, but it is not the structure that forms from the follicle after ovulation.
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