What are the two divisions of the autonomic nervous system (ANS)?

• A. Central and Peripheral
• B. Somatic and Autonomic
• C. Parasympathetic and Sympathetic
• D. Afferent and Efferent

Answer: (C)

The autonomic nervous system (ANS) is a critical component of the peripheral nervous system responsible for regulating involuntary physiological functions. It primarily consists of two divisions: the sympathetic and parasympathetic systems.

The sympathetic division is often associated with the body's fight-or-flight response, preparing the organism to respond to stressful situations. It increases heart rate, dilates pupils, and inhibits digestive processes, among other effects.

In contrast, the parasympathetic division is known for its restorative functions, promoting a state of rest and digestion. It slows the heart rate, constricts pupils, and stimulates digestive activities, allowing the body to conserve energy and enhance recovery.

This division of the autonomic nervous system is crucial for maintaining homeostasis, seamlessly managing the body’s involuntary actions in response to internal and external stimuli. Understanding these two divisions helps highlight how the ANS maintains a balance between energy expenditure and conservation.