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Vasodilation is a widening of the lumen due to smooth muscle contraction.?
Yes
Contraction of the smooth muscle in arterioles would decrease blood pressure?
Contraction of smooth muscle in arterioles would lead to vasoconstriction, which would increase resistance to blood flow and subsequently increase blood pressure. Conversely, relaxation of smooth muscle in arterioles (vasodilation) would decrease resistance and lower blood pressure.
What initinates vasoconstriction and vasodilation?
Vasoconstriction is primarily initiated by the release of vasoconstrictor substances such as norepinephrine and angiotensin II, which cause smooth muscle contraction in blood vessel walls. Conversely, vasodilation is triggered by factors like nitric oxide, prostacyclin, and certain hormones, leading to the relaxation of smooth muscles and widening of blood vessels. Additionally, local metabolic signals such as increased carbon dioxide and decreased oxygen levels can also prompt vasodilation in specific tissues. Thus, these processes are regulated by a complex interplay of neural, hormonal, and local factors.
How does the sympathetic nervous system regulate blood flow through the process of vasodilation or vasoconstriction?
The sympathetic nervous system regulates blood flow by causing either vasodilation (widening of blood vessels) or vasoconstriction (narrowing of blood vessels). When activated, the sympathetic nervous system releases norepinephrine, which binds to receptors on blood vessels. This can either relax the smooth muscle in the vessel walls, causing vasodilation and increased blood flow, or contract the smooth muscle, leading to vasoconstriction and decreased blood flow.
What of the muscle tissue can sustain longer contraction?
smooth muscle
A maximal sustained muscle contraction is called a?
tetanic contraction.
What conditions cause contractions of arteriole smooth muscle?
Asthma causes contraction of the bronchial smooth muscle.
What is relaxation of the smooth muscle in the artery wall which causes the artery wall to become larger?
Vasodilation
What are the muscles that are slow in contraction and relaxation?
smooth muscle
What does noradrenaline do?
It can cause vascular smooth muscle contraction
Why is the endothelium smooth?
Because it is an involuntaru muscle contraction
What is the type of contraction that Peristalsis is seen in?
smooth muscle
