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Among the given options, which statement accurately describes the relative widths of the blood vessels in the renal system?
The afferent arteriole is narrower than the efferent arteriole.
The afferent venule is narrower than the efferent venule.
The efferent arteriole is narrower than the afferent arteriole.
The efferent venule is narrower than the afferent venule.
Answers (1)
In the renal system, the afferent arteriole carries blood into the glomerulus, a network of capillaries involved in the filtration of blood in the kidney. The efferent arteriole, on the other hand, carries blood away from the glomerulus.
The efferent arteriole is narrower than the afferent arteriole to create resistance and maintain a higher blood pressure within the glomerulus. This higher pressure allows for efficient filtration of waste products and substances from the blood into the glomerular filtrate.
Therefore, option 3 correctly identifies that the efferent arteriole is narrower than the afferent arteriole in the renal system.
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