Which of the following is an appropriate description of the function of the renal afferent arteriole?
Facilitates reabsorption of glucose
Reabsorbs potassium and magnesium
Delivers blood supply to the nephron
Acts as a holding area for filtrate
The Correct Answer is C
A. The renal afferent arteriole does not play a role in reabsorbing glucose. Glucose reabsorption occurs in the proximal convoluted tubule of the nephron, not in the afferent arteriole.
B. The afferent arteriole does not reabsorb potassium and magnesium. These electrolytes are reabsorbed in specific segments of the nephron, such as the proximal convoluted tubule and the loop of Henle.
C. The renal afferent arteriole delivers blood to the nephron, specifically to the glomerulus, where filtration of blood occurs. This is its primary function in the kidney's filtration process.
D. The afferent arteriole does not act as a holding area for filtrate. Filtrate is formed in the glomerulus, and it then moves into the Bowman's capsule and through the nephron.
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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. 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.
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