Preganglionic neurons of the _____ system originate in the brain and sacral spinal cord. the preganglionic neurons of the _____ system originate in the thoracic and lumbar spinal cord.
Question: Preganglionic neurons of the _____ system originate in the brain and sacral spinal cord. the preganglionic neurons of the _____ system originate in the thoracic and lumbar spinal cord.
Preganglionic neurons of the parasympathetic system originate in the brain and sacral spinal cord. The preganglionic neurons of the sympathetic system originate in the thoracic and lumbar spinal cord.
The autonomic nervous system (ANS) is divided into two parts: the sympathetic and parasympathetic nervous systems. The sympathetic nervous system is responsible for the "fight or flight" response, while the parasympathetic nervous system is responsible for the "rest and digest" response.
Preganglionic neurons are the first set of neurons in the ANS. They originate in the central nervous system (CNS) and travel to ganglia, which are clusters of nerve cells located outside of the CNS. At the ganglia, the preganglionic neurons synapse with postganglionic neurons, which then travel to the target organs and tissues.
The preganglionic neurons of the sympathetic system originate in the lateral horn of the spinal cord, from segments T1 to L2. These neurons travel to ganglia located along the spinal column. The postganglionic neurons of the sympathetic system then travel to target organs and tissues throughout the body, including the heart, lungs, blood vessels, and digestive system.
The preganglionic neurons of the parasympathetic system originate in the medulla oblongata and sacral spinal cord. These neurons travel to ganglia located near or within the parasympathetic target organs. The postganglionic neurons of the parasympathetic system then travel to the target organs, which include the heart, lungs, stomach, intestines, and bladder.
The sympathetic and parasympathetic nervous systems work together to maintain homeostasis in the body. Homeostasis is the state of balance in the body's internal environment. For example, the sympathetic nervous system increases heart rate and blood pressure during exercise, while the parasympathetic nervous system decreases heart rate and blood pressure after exercise.
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