Doncouse_Jeremy_Week14

Doncouse_Jeremy_Week14 - The Autonomic Nervous System...

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Running head: Chapter 14 1 Week 14 Written Assignment Jeremy Doncouse Mountain State University
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Running head: Chapter 14 2 Chapter 14: The Autonomic Nervous System Introduction 1. Compare the somatic and autonomic nervous systems relative to effectors, efferent pathways, and neurotransmitters released. Both have motor fibers but differ in their effectors, in their pathways, and in target organ responses to their neurotransmitters. Somatic System ANS Stimulates skeletal muscles Stimulates cardiac muscle, smooth muscle, and glands Motor neuron cell body in CNS, one neuron extends to effector organ. Motor unit is a 2 neuron chain. Preganglionic neuron cell body in s.c., synapses outside CNS, postganglionic axon extends to the effector organ. Axons are myelinated. Conduction is fast. Preganglionic axons are lightly myelinated. Postganglionic neurons are unmyelinated. Conduction is slower. All motor neurons secrete acetylcholine at synapse with effector. Postganglionic neurons secrete acetylcholine or norepinephrine at synapse with effector. Response is always excitation. Response may be either excitation or inhibition depending on the nature of receptors present on target organ. 2. Compare and contrast the general functions of the parasympathetic and sympathetic divisions.
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Running head: Chapter 14 3 Two major arms are the parasympathetic sympathetic. Generally they serve the same visceral organs but cause essentially opposite effects. The two divisions counterbalance each other's activities. The parasympathetic system is primarily concerned with activities that conserve and restore body energy during times of rest or recovery of the body. ("Resting and digesting system") Under normal conditions, parasympathetic impulses to the digestive glands and
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Doncouse_Jeremy_Week14 - The Autonomic Nervous System...

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