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Reducing this muscle will reduce the airways ability to constrict which in turn may reduce the severity and frequency of asthma symptoms.
Stress causes the body to release 17 different hormones, which makes digestion stop and blood vessels constrict.
In laboratory animals, a magnet can act like a switch to either open or constrict tiny blood vessels, researchers report.
Vessels need to widen and constrict to keep up with the constantly changing demands of the body.
In fact, says Levine, measurements of vein size and capability to constrict blood vessels may predict which people are most likely to develop orthostatic intolerance after a space flight.
As the brain's blood vessels constrict and then dilate, it produces an intensely painful headache usually, but not always, on one side of the head.
High concentrations of ET-1 can constrict blood vessels, a condition that can contribute to heart disease.
Consistent, low doses of caffeine - one to two cups of coffee daily, for example - constrict blood vessels in the head.
Because beta-blockers slow the pulse rate and constrict airways, they might cause complications in people with heart and lung problems.
With its prey still in its toothy grasp, the snake constricts, or coils around its meal.
Epinephrine (also known as adrenaline) increases the heart rate, constricts blood vessels, and opens the airways--a reaction often called the "fight or flight" response.
Signed in 2002 by President Bush (who had promised to veto any measure of the sort that constricts freedom of speech), the law places severe restrictions on political speech--via advertisements and other public messages--that mentions political candidates within an election period.