Examlex
The hypothalamus is the evolutionarily oldest structure and contains cells that control relatively primitive responses.
Autonomic Nervous System
The part of the peripheral nervous system that controls the glands and the muscles of the internal organs (such as the heart). Its sympathetic division arouses; its parasympathetic division calms.
Sympathetic Nervous System
The division of the autonomic nervous system that arouses the body, mobilizing its energy in stressful situations.
Parasympathetic Nervous System
The division of the autonomic nervous system that calms the body, conserving its energy.
Somatic Nervous System
The division of the peripheral nervous system that controls the body’s skeletal muscles. Also called the skeletal nervous system.
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