Question

The parasympathetic branch of the ANS ________________. Select all that apply. Multiple answers: Multiple answers are accepted for this question Select one or more answers and submit. For keyboard navigation...SHOW MORE a originates in the thoracic region of the spinal cord. b innervates organs and tissues only in the bottom half of the body.

Answer 1

The parasympathetic division of the ANS originates in the brainstem and sacral spinal cord, regulating the 'rest and digest' functions of the body.

Step-by-step explanation:

The parasympathetic branch of the autonomic nervous system (ANS) is also known as the craniosacral system, because its preganglionic neurons are located in the nuclei of the brainstem and the lateral horn of the sacral spinal cord.

Contrary to the options given in the question, the parasympathetic system does not originate in the thoracic region nor does it innervate organs and tissues only in the bottom half of the body.

Instead, it is involved in returning the body to routine, day-to-day operations such as slowing the heartbeat, lowering blood pressure, and stimulating digestion, often described as the "rest and digest" functions.

Answer 2

The parasympathetic branch of the ANS originates in the craniosacral outflow, with preganglionic neurons in the brainstem and sacral regions of the spinal cord, and it helps the body 'rest and digest.'

Step-by-step explanation:

The parasympathetic branch of the ANS is not linked to the thoracic region of the spinal cord but originates in the craniosacral outflow, with preganglionic neurons located in the brainstem and sacral spinal cord regions. It is involved in the body's 'rest and digest' functions, contrasting with the sympathetic nervous system, which prepares the body for 'fight or flight' responses. Functions of the parasympathetic system include slowing down the heartbeat, lowering blood pressure, and stimulating digestion.