Which of the following is a membrane protein that permits ion passage into or out of a cell?
Vesicle
Enzyme
Channel
Lysosome
The Correct Answer is C
A. A vesicle is involved in the transport of substances within or out of the cell via processes like endocytosis or exocytosis but does not directly permit ion passage across the membrane.
B. An enzyme catalyzes chemical reactions and is not directly involved in the transport of ions across the cell membrane.
C. A channel protein facilitates the passage of ions across the cell membrane, allowing specific ions to move in and out of the cell based on concentration gradients.
D. A lysosome is an organelle responsible for digesting and breaking down waste materials within the cell, not for ion transport across the membrane.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Cardiac index is a measure of cardiac output adjusted for body surface area. It provides a more individualized view of heart function but does not specifically refer to the amount of blood ejected during each contraction.
B. Cardiac output refers to the total volume of blood pumped by the heart per minute, which is the product of stroke volume and heart rate. However, it describes the total blood output over time, not the blood ejected per contraction.
C. Stroke volume is the volume of blood ejected from the left ventricle with each contraction. It is a key measurement of heart function.
D. Ejection fraction is the percentage of blood in the left ventricle that is ejected during each contraction. While related to stroke volume, it is a ratio rather than the actual volume of blood ejected.
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.
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