PBHL 2203 Chapter Notes - Chapter 2: Sympathetic Nervous System, Cerebral Cortex, Sensory Nerve

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Sensory nerve fibers provide input to the brain and spinal cord signaled from sensory receptors. Motor nerve fibers provide output from the brain or spinal cord to muscles and other organs, resulting in voluntary and involuntary movement. The sns connects to voluntary muscles and provides the brain with feedback in the form of sensory information. The ans connects the cns to all the internal organs over which people don"t have voluntary control over. The sympathetic nervous system prepares the body to respond to emergencies, to strong emotions such as anger or fear, and to strenuous activity. The parasympathetic nervous systems control the activities of organs under normal circumstances and acts antagonistically to the sympathetic nervous system. The brain is the command center of the be body. It receives afferent (sensory) impulses from the peripheral nerve endings and sends efferent (motor) impulses to the extremities and to the internal organs to carry out necessary movement.

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