Question

Which of these is NOT an aspect of the micturition reflex arc?It is stimulated by mechanoreceptors.The diameter of the urethra increases.CNS processing occurs in the sacral cord.The effector is the detrusor muscle.

Answer 1

The micturition reflex arc is responsible for the process of urination. It involves several aspects, but stimulation by mechanoreceptors is not one of them.

Step-by-step explanation:

The micturition reflex arc is responsible for the process of urination. It involves several aspects, but stimulation by mechanoreceptors is not one of them. The micturition reflex is actually stimulated by stretch receptors in the bladder wall. When the bladder fills with urine and reaches a certain volume, these stretch receptors send nerve impulses to the sacral region of the spinal cord. This generates a spinal reflex that initiates the micturition process.

The other aspects of the micturition reflex arc are:

• The diameter of the urethra increases
• CNS processing occurs in the sacral cord
• The effector is the detrusor muscle

Answer 2

The micturition reflex arc consists of several aspects including CNS processing in the sacral cord, a increase in urethral diameter, stimulation by mechanoreceptors, and the use of the detrusor muscle as the effector.

Step-by-step explanation:

The micturition reflex arc consists of several aspects that work together to control urination. It is important to note that CNS processing occurs in the sacral cord. This means that the bladder signals are processed in the spinal cord, specifically in the sacral region, and not in the brain. However, the diameter of the urethra increases during the micturition reflex to allow urine to flow out of the bladder. The reflex is also stimulated by mechanoreceptors in the bladder wall that sense the stretching of the bladder as it fills with urine. Finally, the effector of the micturition reflex is the detrusor muscle, which contracts to help expel urine from the bladder.