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Assertion: Resistance to blood flow is positively correlated with blood viscosity.
Reason: Polycythemia exacerbates resistance, consequently elevating blood pressure.
The assertion is true, but the reason is false.
The assertion is false, but the reason is true.
Both the assertion and reason are true and are correctly related.
Both the assertion and reason are true but are incorrectly related.
Answers (1)
The assertion states that resistance to blood flow is positively correlated with blood viscosity, which is true. Higher blood viscosity due to factors such as increased red blood cell count or plasma protein concentration can contribute to increased resistance to blood flow.
The reason given is that polycythemia exacerbates resistance, consequently elevating blood pressure. While it is true that polycythemia, a condition characterized by an increased number of red blood cells, can lead to higher blood viscosity, it does not necessarily imply a direct relationship with elevated blood pressure. Blood pressure is influenced by various factors, including cardiac output, peripheral resistance, and blood volume.
Therefore, although both the assertion and reason are true, they are incorrectly related. Polycythemia can contribute to increased resistance due to higher blood viscosity, but its direct impact on blood pressure is more complex and involves other physiological factors.
Hence, the correct answer is option 4.
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