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Sympathetic activation causes blood vessels to constrict by releasing a neurotransmitter called norepinephrine, which binds to receptors on the smooth muscle cells of the blood vessels. This binding triggers a series of events that ultimately lead to the contraction of the smooth muscle, resulting in the narrowing of the blood vessels.
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How does sympathetic vasoconstriction or vasodilation affect blood flow in the body?
Sympathetic vasoconstriction decreases blood flow by narrowing blood vessels, while sympathetic vasodilation increases blood flow by widening blood vessels.
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.
How does an increase in sympathetic nervous system activity affect blood pressure?
An increase in sympathetic nervous system activity can lead to higher blood pressure. This is because the sympathetic nervous system releases hormones like adrenaline, which can cause blood vessels to constrict and the heart to beat faster, resulting in elevated blood pressure.
Why pontine lesion cause pinpoint pupil?
Pontine lesions can affect the fibers of the Edinger-Westphal nucleus, which is responsible for pupil constriction. Damage to this area can result in unopposed sympathetic input, causing the pupils to become pinpoint due to prolonged pupillary constriction.
How does an increase in the sympathetic nervous system affect stroke volume?
An increase in the sympathetic nervous system can lead to an increase in stroke volume. This is because the sympathetic nervous system stimulates the heart to beat faster and with more force, resulting in more blood being pumped out with each heartbeat.
How does sympathetic vasoconstriction or vasodilation affect blood flow in the body?
Sympathetic vasoconstriction decreases blood flow by narrowing blood vessels, while sympathetic vasodilation increases blood flow by widening blood vessels.
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 are sympathetic chains?
it affect the organs of heart,stomach,liver,kidney,blood vessels,trachea-lungs,pupil,glands,intestine and bladder......
Does morphine affect the parasympathetic or the sympathetic nervous system?
Sympathetic
How does an increase in sympathetic nervous system activity affect blood pressure?
An increase in sympathetic nervous system activity can lead to higher blood pressure. This is because the sympathetic nervous system releases hormones like adrenaline, which can cause blood vessels to constrict and the heart to beat faster, resulting in elevated blood pressure.
How does the synaptic nervous system affect the iris?
The iris is not innervated directly, however the iris sphincter muscle is affected by the sympathetic and parasympathetic nervous systems. Sympathetic stimulation causes pupil dilation while parasympathetic nervous system causes pupil constriction. The parasympathetic response is quicker because of the proximity of a parasympathetic ganglion (ciliary ganglion) to the eye. The sympathetic response is slower because all sympathetic ganglia are confined to the spinal cord. This is the reason why people adjust faster to a bright shining light than darkness.
How does activation energy affect the progress affect the progress of a reaction?
The reaction will not occur unless the activation energy is met.
Why pontine lesion cause pinpoint pupil?
Pontine lesions can affect the fibers of the Edinger-Westphal nucleus, which is responsible for pupil constriction. Damage to this area can result in unopposed sympathetic input, causing the pupils to become pinpoint due to prolonged pupillary constriction.
How do sympathetic and parasymphatetic activity affect gastric secretion?
Sympathetic activity inhibits gastric secretion by causing vasoconstriction of blood vessels in the stomach lining. Parasympathetic activity stimulates gastric secretion by increasing blood flow and activating gastric glands, leading to increased production of stomach acid and digestive enzymes.
What parts of the body does reflex sympathetic dystrophy affect?
"Reflex Sympathetic Dystrophy usually affects the skin and blood vessles. However, it can easily affect any part of the body."
How does activation energy affect the length of a reaction?
as activation energy decreases, reaction will finish faster (length of reaction decreases)
Why does catalyst affect reaction speed?
The activation energy is reduced.
