A model holds other conditions constant while narrowing a blood vessel. What change does the model predict?
AResistance decreases and flow increases.✗ Incorrect
A narrower vessel offers more, not less, opposition to flow.
BResistance increases and flow decreases.✓ Correct
A smaller diameter increases resistance, reducing flow.
CResistance and flow both increase.✗ Incorrect
Increased resistance from narrowing is associated with reduced flow.
DResistance and flow both remain unchanged.✗ Incorrect
Vessel diameter affects resistance and therefore flow.
Answer
B. Resistance increases and flow decreases.
Rationale
Diameter affects how strongly a vessel opposes movement of blood. With the other conditions held constant, narrowing raises resistance and reduces flow.
RememberA narrower vessel produces greater resistance to blood flow.
Sources
Physiology of CirculationSEER Training Modules, National Cancer Institute · License: US government work (public domain) · Retrieved · Blood Flow
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