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Vasoconstriction

vasoconstriction

The diminution of the calibre of vessels, especially constriction of arterioles leading to decreased blood flow to a part.


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Re: please help! understanding resistance: decreasing or increas

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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by pulle998
Tue Sep 22, 2009 4:02 am
 
Forum: Physiology
Topic: please help! understanding resistance: decreasing or increas
Replies: 1
Views: 2395

please help! understanding resistance: decreasing or increas

... 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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by sohel2009
Sun Sep 20, 2009 7:13 am
 
Forum: Physiology
Topic: please help! understanding resistance: decreasing or increas
Replies: 1
Views: 2395

SAC thermoregulation

... 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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by Joker
Mon Apr 27, 2009 3:36 pm
 
Forum: Cell Biology
Topic: SAC thermoregulation
Replies: 0
Views: 2077

Headaches

... 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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by Dr.Stein
Thu Jan 11, 2007 8:04 am
 
Forum: Human Biology
Topic: Headaches
Replies: 20
Views: 6954

Sympathetic nervous system + vasoconstriction

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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by wu_tang_1989
Thu Nov 30, 2006 2:05 am
 
Forum: Human Biology
Topic: Sympathetic nervous system + vasoconstriction
Replies: 2
Views: 3483
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