What is the difference between the effects of crossed and parasympathetic nerves on the gastrointest

When the sympathetic nervous system is excited, what about people? Nervous, the patient has no hunger, the secretion of digestive juice is reduced, and when the gelatinous sensory nerve is excited, the patient is hungry and the digestive juice secretion is more.

1. Different distribution locations: sympathetic nerve fibers are mainly distributed in organs such as sweat glands, blood vessels, and smooth muscles, while parasympathetic nerve fibers are mainly distributed in secretory glands, eye muscles, trachea, heart, liver, pancreas, spleen, kidney, and gastrointestinal organs.

2. Different functions: when the sympathetic nerve is excited, it will cause the body's energy consumption to increase, and the functional activities of organs will be enhanced, such as increased heart rate, increased blood pressure, faster breathing, increased blood sugar, and the peristaltic secretion function of the gastrointestinal tract will be inhibited. Parasympathetic nervous system excitation inhibits the body's losses and increases energy storage, that is, the sympathetic nervous system is actually antagonistic to each other.

3. The lower central parts are different: the lower center of the sympathetic nerve is located in the lateral nucleus of the median zone of the gray matter in the thorax and waist of the spinal cord, and the lower center of the parasympathetic nerve is located in the general visceral motor nucleus of the brainstem and the sacral parasympathetic nucleus of the spinal cord and sacral.

Answer]: c sympathetic nervous system generally has an inhibitory effect on digestive activity; Parasympathetic nervous system generally plays an excitatory role in digestive activity.

The role of the para hand to take the line of acres of the sense nerve is ().

a.Causes the ciliary muscles to contract.

b.Relaxes bronchial smooth muscles.

c.Inhibits saliva secretion.

d.Promotes adrenaline secretion.

e.Promotes glycolysis and increases blood sugar concentration.

The correct answer is fierce: a

The parasympathetic nerve endings that innervate the parasympathetic nerve endings of the gastrointestinal tract release the Divine Epithetical Parameridian transmitter is ()aNorepinephrine.

b.Acetylcholine.

Serotonin. d.Glutamic acid.

e.Vasoactive intestinal peptide.

Positive staring at the pure answer: B

1. The difference between sympathetic and parasympathetic nerves:

1. The central part is different.

The lower center of the sympathetic nerve is located in the lateral angle of the first thoracic segment to the third lumbar segment of the spinal cord, and the lower center of the parasympathetic nerve is located in the brainstem and sacral part of the spinal cord.

2. The location of the peripheral ganglia is different.

The sympathetic preganglionic fibers emanating from the lateral horns leave the spinal nerve along with the anterior root and spinal nerve out of the intervertebral foramen and reach the sympathetic ganglia.

After a portion of neurons are exchanged within the ganglion, the postganglionic fibers leave the sympathetic trunk and return to the spinal nerve, where they are distributed with the spinal nerve to the blood vessels, sweat glands, and erector pili muscles of the continental limbs and body wall. After most of the preganglionic fibers exchange neurons within the sympathetic trunk, the postganglionic fibers no longer join the spinal nerves and form plexuses around the arteries, which are distributed with the arteries to the organs and glands of the head, neck, and thoracic and abdominal cavities.

The parasympathetic nerve from the center of the preganglionic fibers in the parasympathetic ganglion exchange neurons, postganglionic fibers are distributed to smooth muscle, myocardium and glands, the parasympathetic ganglia are generally near the organ or in the organ wall, the postganglionic fiber is short.

3. The effects of the two on the same organ are different.

When the sympathetic nerve is excited, the abdominal viscera and peripheral blood vessels constrict, and the heartbeat accelerates and strengthens; bronchial smooth muscle dilation; inhibition of gastrointestinal motility and gastric secretion; hypermetabolism; mydriasis, etc.

When parasympathetic is excited, the heartbeat slows and decreases; bronchial smooth muscle contraction; Gastrointestinal motility strengthens and promotes the secretion of digestive juices; miosis, etc. Generally, internal organs have sympathetic and parasympathetic dual branches, and the effects of these two nerves on the same organ are usually antagonistic, but the activities of the two types of nerves in the whole are opposite, unified and coordinated with each other.

2. The connection between sympathetic and parasympathetic nerves:

When the body is in a calm state, the excitation of the parasympathetic nerve is dominant, which is conducive to the digestion and absorption of nutrients and the replenishment of energy, and is conducive to the protection of the body. When exercising vigorously or in an adverse environment, the sympathetic nervous system activity is strengthened, mobilizing the potential of many organs of the body to improve the ability to adapt to rapid changes in the environment, and maintain the relative stability of the internal environment.

Answer]: This spring b

The main functions of the sympathetic nerve are dilated pupils, rapid heartbeat, skin and visceral vasoconstriction, coronary artery dilation, increased blood pressure, bronchial dilation, gastrointestinal peristalsis, relaxation of bladder wall muscles, and decreased saliva and gastrointestinal secretion.