The answer is true
The hint is "point-source"
Answer:
Answer is C.
Explanation:
A. The vessel length is pretty much constant. The body can't length or shorten blood vessels.
B. Blood viscosity is also fairly constant because the composition of blood cannot change quickly enough to change resistance as needed.
C. This is the main way resistance is controlled. The smooth muscle surrounding blood vessels can rapidly respond to hormonal or metabolic stimuli and contract/relax to adjust diameter.
D. Again, temperature is fairly constant in the body and would not be a good way to alter resistance.
I think the correct answer from the choices listed above is option D. The flawed logic in this statement is an example of a false dichotomy. It is also referred to as false dilemma which involves having two opposite views in such a way that they seem to be the only possibilities.<span />
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