Vasoconstriction

I'm not exactly sure, but I think the question is whether all the factors in combination (vasoconstriction/dilation, viscosity, vessel cross sectional area, length, ect.) function to decrease or increase the velocity of the blood. Velocity varies inversely with pressure ...

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... to flow..(because of this reason, i understand why there is a drop in MAP in the arterioles) 2. but i found in the other part, that the arteries vasoconstriction ( which means that the vessels radius is becoming smaller) will elevate the MAP.. i am quiet confuse understanding this contradictions ...

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... responds to really cold and really hot environments. So far I've done a bit of researching and reading on the topic and found little things like: vasoconstriction or vasodilation of arterioles and capillaries. However, does anyone know if there is more that I can do? How can I prepare for this ...

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... is vasodilatation, which causes nerves between capillaries pressed. Nerve endings for pressure and painful will send the information to the brain. Vasoconstriction can result in the same painful feeling as the supply of oxygen which is brought by RBC is decreasing.

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Im quite confused. Since the sympathetic nervous system causes the heart rate to increase (thus more blood is pumped round the body), why do the vessels vasoconstrict? Doesn't this cause the vessels to become narrow and thus less blood can flow? Id appreciate any help Thank you

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