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Does coronary vessels have both parasympathetic and sympathetic innervation?
Yes, coronary vessels have both parasympathetic and sympathetic innervation. Parasympathetic input leads to vasodilation of coronary vessels, while sympathetic input can cause vasoconstriction in response to stress or exercise. The balance between these two systems helps regulate blood flow to the heart.
What will sympathetic stimulation of the eye do?
Sympathetic stimulation of the eye will cause dilation of the pupil (mydriasis) and relaxation of the ciliary muscle for far vision.
What process causes heat and redness to occur during the inflammatory process?
chemicals released by the injured tissue cells and leukocytes cause the VASODILATION of the arterioles in the injured area and cause the local hyperemia to form accounting for the redness and heat.
Does the sympathetic nervous system cause vasoconstriction?
Yep! The sympathetic nervous system causes both vasoconstriction & vasodilation. During "fight or flight" you need more O2/blood delivered to your skeletal muscles. The SNS causes vasodilation in skeletal muscles. The other organs, of the body (like digestive organs) are not needed for "fight or flight" survival. The SNS causes vasoconstriction in these organs.
In which part of the circulatory system does the greatest pressure drop occur?
The greatest pressure drop in the circulatory system occurs in the arterioles. Arterioles are small, muscular blood vessels that regulate blood flow and control blood pressure. As blood travels from the arteries to the capillaries, the arterioles cause a significant decrease in pressure to ensure proper exchange of nutrients and waste between the blood and tissues.
Does sympathetic activity cause vasodilation?
No, sympathetic activity typically causes vasoconstriction, not vasodilation.
Does coronary vessels have both parasympathetic and sympathetic innervation?
Yes, coronary vessels have both parasympathetic and sympathetic innervation. Parasympathetic input leads to vasodilation of coronary vessels, while sympathetic input can cause vasoconstriction in response to stress or exercise. The balance between these two systems helps regulate blood flow to the heart.
What would cause vasoldilation of arterioles?
decreased activity of the sympathetic nervous system
Does the sympathetic system cause vasodilation?
Yes, the sympathetic nervous system can cause vasodilation in certain situations, such as during exercise or in response to stress. This is because the sympathetic system releases certain neurotransmitters that can relax blood vessels and increase blood flow to muscles and other tissues.
Does the sympathetic nervous system cause vasodilation?
Yes, the sympathetic nervous system can cause vasodilation through the release of certain neurotransmitters that relax the smooth muscles in blood vessel walls, allowing them to widen and increase blood flow.
What will sympathetic stimulation of the eye do?
Sympathetic stimulation of the eye will cause dilation of the pupil (mydriasis) and relaxation of the ciliary muscle for far vision.
The redness and heat of an inflamed area are due to a local hyperemia caused by?
chemicals released by the injured tissue cells and leukocytes cause the VASODILATION of the arterioles in the injured area and cause the local hyperemia to form accounting for the redness and heat.
Does the sympathetic nervous system primarily cause vasodilation or vasoconstriction in the body?
The sympathetic nervous system primarily causes vasoconstriction in the body.
What are the effectors that cause vasodilation and vasoconstriction?
Vasodilation is primarily caused by factors like nitric oxide, prostaglandins, and certain medications like calcium channel blockers. On the other hand, vasoconstriction is mainly brought about by substances such as endothelin, angiotensin II, and sympathetic nervous system activation through norepinephrine release.
How does sympathetic activation affect blood vessel diameter, leading to either vasodilation or vasoconstriction?
Sympathetic activation can cause blood vessels to either dilate (vasodilation) or constrict (vasoconstriction) by releasing neurotransmitters that bind to receptors on the blood vessel walls. When the sympathetic nervous system is activated, it releases norepinephrine, which can bind to alpha-adrenergic receptors on blood vessels, causing them to constrict and decrease blood flow. Alternatively, the release of epinephrine can bind to beta-adrenergic receptors, leading to vasodilation and an increase in blood flow.
What is the integrating center for the negative feedback loop that regulates body temp?
There are two main components: 1- Positive feedback- The inciting event is heat radiation stimulating anterior hypothalamus nerves that cause stimulation. These then stimulate inhibiting nerves which cause hyperpolarization of sympathetic nerve systems 2- Negative feedback- The inhibition causes a decrease in sympathetic tone causing vasodilation of the vasculature, that results in heat loss. The returning temperature of blood decreases, resulting in less transfer of heat radiation, and thus homeostasis of body temp. The opposite for decrease heat radiation. Stimulus to cold: 1- Positive feedback- Decrease in transfer of heat energy causes less depolarization of nerves in the hypothalamus, thus less stimulation of inhibitory nerve cells regulating sympathetic tone. 2- Negative feedback- Less positive inhibition causes increased activity of sympathetic nerve ending, thereby increasing vasculature tone, and thus vasoconstriction, and decreased body heat loss. Thus, the global negative feedback is a complex interplay of several negative and positive loops, that account for: increase heat radiation->increased vasodilation through inhibition of sympathetic tone. Decreased heat radiation->decreased vasodilation (vasoconstriction) through decreased inhibition of sympathetic tone. To answer the question more simply: anterior hypothalamus (inhibitory neurons by positive effect from heat sensing neurons) and sympathetic nervous system
Dilation and relaxation of the bronchioles are possible bcause of the presence of?
Beta 2 adrenergic receptors in lung tissue cause dilation of bronchioles via sympathetic stimulation.
