Peripheral Nervous System. Somatic System Largely under voluntary control Sensory neurons carry information about the external environment inward from.

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Presentation transcript:

Peripheral Nervous System

Somatic System Largely under voluntary control Sensory neurons carry information about the external environment inward from the skin, tendons and skeletal muscles. Motor neurons carry information to the skeletal muscles.

Autonomic System Under automatic, or involuntary control HYPOTHALAMUS and MEDULLA OBLONGATA control the autonomic system. Two divisions: sympathetic and parasympathetic

Sympathetic Nervous System Fight-or-flight response. Ways to stimulate the sympathetic nervous system: The sympathetic neurons release a neurotransmitter called norepinephrine (excitatory effect on target muscles). The adrenal glands release epinephrine and norepinephrine that activate the stress response. At the same time, inhibits some areas of the body to maintain homeostasis.

Parasympathetic Nervous System Activated when the body is calm and at rest. Acts to restore and conserve energy. Rest-and-digest response. Examples: slows heart rate, reduces blood pressure.

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