Credit: INTELECOM /SCIENCE PHOTO LIBRARY

Caption: A graphic comparison of the somatic and autonomic nervous systems as well as the sympathetic and parasympathetic nervous systems. The somatic nervous system enables voluntary responses to environmental stimuli. It controls the skeletal muscles after the brain has given its orders. The autonomic nervous system is responsible for keeping the body running smoothly without conscious effort _in most cases, automatically . In both branches, preganglionic axons release acetylcholine onto excitatory nicotinic receptors of the postganglionic axon. However it is the neurotransmitters of the postganglionic axons which are responsible for the antagonistic actions of the autonomic nervous system. Sympathetic postganglionic axons release either acetylcholine or norepinephrine on effectors. ach binds to cholinergic muscarinic receptors of sweat glands and skeletal muscle blood vessels to increase sweat release and blood flow. At the same time, ne binds to adrenergic receptors of all other structures. In most all cases, these actions are seen as excitatory. (w titles).

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Keywords: autonomic, central nervous system, kidney, muscular system, nerve, nervous system, organ, parasympathetic nervous system, peripheral nervous system, post ganglionic, pre ganglionic, somatic, spinal cord, sympathetic nervous system

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Somatic and autonomic nervous systems

K005/0687 Rights Managed

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Duration: 00:01:28.22

Frame size: 1920x1080

Frame rate: 29.97

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Format: QuickTime, Photo JPEG 100%, progressive scan, square pixels

File size: 2.6G

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Capture format: QuickTime Animation

Codec: Photo - JPEG

Interlaced: Yes

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