Which Statement Represents the Correct Order of the Reflex Arc

question 12

Multiple Choice

Which statement represents the correct order of the reflex arc for micturition?

• A) The reflex arc begins with stretch receptors sending signals to the sacral region of the spinal cord - stretch receptors receive signals in the urinary bladder's walls - the detrusor muscle contracts the internal urethral sphincter relaxes - parasympathetic neurons go from the spinal cord to the detrusor muscle - urine is passed.
• B) The reflex arc begins with stretch receptors in the urinary bladder's walls - stretch receptors send signals to the sacral region of the spinal cord - the detrusor muscle contracts the internal urethral sphincter relaxes - parasympathetic neurons go from the spinal cord to the detrusor muscle - urine is passed.
• C) The reflex arc begins with stretch receptors in the urinary bladder's walls - stretch receptors send signals to the sacral region of the spinal cord - parasympathetic neurons go from the spinal cord to the detrusor muscle - the detrusor muscle contracts the internal urethral sphincter relaxes - urine is passed.
• D) The reflex arc begins with stretch receptors in the urinary bladder's walls -parasympathetic neurons go from the spinal cord to the detrusor muscle - stretch receptors send signals to the sacral region of the spinal cord - the detrusor muscle contracts the internal urethral sphincter relaxes - urine is passed.

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Definitions:

Acetylcholine

A neurotransmitter in the nervous system that plays a critical role in muscle contraction and the modulation of alertness, memory, and learning.

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Histamine

An organic nitrogenous compound involved in local immune responses, as well as regulating physiological functions in the gut and acting as a neurotransmitter.

Threat Simulation Theory

A theory suggesting that dreaming serves an evolutionary purpose of practicing how to behave in potentially dangerous situations.