with stimulation of the sympathetic nervous system there will be a. constriction of the pupils b. dilation of the coronary arteries c. constriction of selected blood vessels d. profuse sweating
Bronchodilation.
Sympathetic stimulation causes vasoconstriction of most arterioles in the body, except for arterioles in skeletal muscle and the heart where it causes vasodilation.
Sympathetic stimulation causes relaxation of the rectum's smooth muscle, leading to decreased motility and tone. This can result in decreased urgency and the ability to retain feces.
Stimulation of the sympathetic nervous system causes the kidneys to constrict blood vessels, reducing blood flow to the kidneys. This can lead to a decrease in urine production and help conserve body fluids in times of stress or emergency. Additionally, the sympathetic nervous system can stimulate the release of renin, an enzyme involved in blood pressure regulation.
Sympathetic stimulation of the trachea causes the trachealis muscle to relax, giving the trachea a large cross-sectional area. This allows increased air flow because of the increased diameter and less resistance.
The best example of cooperative autonomic effects is seen in controls of the external genitalia. Parasympathetic stimulation causes vasodilation of blood vessels in the external genitalia, and is responsible for erection of the male penis or female clitoris during sexual excitement. Sympathetic stimulation then causes the ejaculation of semen by the penis or reflex contractions of the vagina during an orgasm.
Yes, dilation of the pupil is primarily controlled by the sympathetic division of the autonomic nervous system. When the sympathetic system is activated, it causes the pupil to dilate, allowing more light to enter the eye.
with stimulation of the sympathetic nervous system there will be a. constriction of the pupils b. dilation of the coronary arteries c. constriction of selected blood vessels d. profuse sweating
Yes it does relax. When the detrusor muscle, part of the bladder wall, constricts, you urinate. In a high energy situation, when sympathetic stimulation is occurring, you wouldn't want to urinate, so the wall must relax.
The parasympathetic division of the autonomic nervous system is typically activated in situations of rest and relaxation, such as after a meal or during sleep. It counteracts the "fight or flight" response of the sympathetic division, promoting activities like digestion, conservation of energy, and restorative processes in the body. Stimulation of the parasympathetic nerves can also occur through activities like deep breathing, meditation, and gentle exercise.
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.