Definition

Noun: - Autonomic Nervous System: A major division of the nervous system in vertebrates that controls involuntary physiological processes, including heart rate, digestion, respiratory rate, and glandular secretion. It operates largely below the level of consciousness and is divided into the sympathetic and parasympathetic systems.

Usage

• The term ANS is used primarily in medical, biological, and physiological contexts to refer to the system regulating automatic bodily functions.
• It is often used in its abbreviated form, especially in technical writing.

Examples

• Noun:
  • The patient's symptoms suggested a dysfunction of the ANS.
  • The autonomic nervous system (ANS) regulates the fight-or-flight response.

Advanced Usage

• "ANS activity": Refers to the functional state or output of the autonomic nervous system.
  • The study measured ANS activity through heart rate variability.
• "ANS dysfunction": A condition where the autonomic nervous system does not work properly.
  • Diabetes can sometimes lead to ANS dysfunction.

Variants and Related Words

• Autonomic Nervous System: The full, unabbreviated term for ANS.
• Sympathetic Nervous System: A subdivision of the ANS responsible for mobilizing the body's resources under stress (the "fight-or-flight" system).
• Parasympathetic Nervous System: A subdivision of the ANS responsible for conserving energy and promoting "rest-and-digest" functions.

Synonyms

• Visceral Nervous System: An older, less common term for the autonomic nervous system, emphasizing its control over internal organs.
• Involuntary Nervous System: A descriptive synonym highlighting its control over involuntary actions.

Related Phrases

• "ANS imbalance": A state where the sympathetic and parasympathetic branches of the ANS are not in equilibrium.
  • Chronic stress can cause an ANS imbalance.
• "ANS testing": Medical procedures designed to assess the function of the autonomic nervous system.
  • The neurologist ordered ANS testing to evaluate the cause of the dizziness.

Noun

1. the part of the nervous system of vertebrates that controls involuntary actions of the smooth muscles and heart and glands