Blood vessels in the brain of a cocaine user will narrow so that means the vessels contract.
vasoconstrictor
The answer to this true or false question is false. I got this answer from the last part... constrictor. constricting means to get smaller. There for the answer is false.
yes
True
The highest pressure against the blood vessels is Systolic Pressure, and it occurs when the ventricles contract.
By activating nitric oxide synthase and prostagladin pathways.
The second layer surrounding the lumen in blood vessels is the tunica media. It is composed of smooth muscle cells and elastic fibers, allowing it to contract and expand to regulate blood flow and pressure.
No it causes them to dilate (vasodilation)
When the heart beats it causes blood to flow through the blood vessels which causes them to expand. This expansion can be felt by touching the vessels that are close to the skin.
Veins contract and expand in response to blood pressure.
They're both formed of "smooth muscles", which have the following aspects: * They can contract or expand hard and slow * They can contract or expand soft and fast * They do not fatigue in the way striated muscles do (every heard anyone say, "My veins sure are tired?" They comprise the circulatory system.