What receptors are stimulated in micturition?

During micturition, supraspinal centers block stimulation by the hypogastric and pudendal nerves. This relaxes the internal and external sphincters and removes the sympathetic inhibition of the parasympathetic receptors. The result is unobstructed passage of urine when the detrusor contracts.

What organs are in micturition reflex?

Micturition or urination is the process of emptying urine from the storage organ, namely, the urinary bladder. The detrusor is the smooth or involuntary muscle of the bladder wall. The urethral muscles consist of the external and internal sphincter.

What kind of receptors start the micturition urination reflex?

Stretch receptors in the bladder increase their firing rate as the bladder becomes more full. This causes the micturition reflex, and increases urinary urge, and can even cause involuntary urination.

What is the stimulus for the micturition reflex?

The primary stimulus for urination is distension of the bladder. Although the smooth muscle of the bladder wall elongates plastically in response to continued stretch, receptors in the trigone do initiate impulses up to a centre for micturition, and indeed, to consciousness.

What occurs during the micturition urination reflex quizlet?

What occurs during the micturition reflex? -parasympathetic motor neurons that control the detrusor muscle become active. -the internal sphincter is subconsciously relaxed. -stimulation of stretch receptors in the bladder wall sends impulses to the sacral cord.

Is micturition voluntary or involuntary?

voluntary control
The external urethral sphincter (sphincter urethrae) is under voluntary control and is consciously relaxed during micturition. Hence micturition is a reflex process but under some voluntary control.

Which of the following stimulates micturition quizlet?

Which of the following directly stimulates micturition? Stretching of the urinary bladder wall by urine will stimulate micturition.

Where is the micturition reflex quizlet?

What initiates the micturition reflex? Stretch receptors in the wall of the urinary bladder signal the sacral region of the spinal cord.

Is micturition a reflex process?

The micturition reflex is one of the autonomic reflexes, but the release of urine is regulated by voluntary neural mechanisms that involve centers in the brain and spinal cord.

What happens during micturition reflex quizlet?

Which receptors are involved in the micturition reflex?

Stimulus: Volume of urine that initiates micturition reflex is 300-400 ml 2. Receptor: Stretch receptors in bladder wall 3. Afferent: Pelvic parasympathetic 4. Centre: S2–S4 5. Efferent: Pelvic parasympathetic

What is the volume of urine that initiates the micturition reflex?

Stimulus: Volume of urine that initiates micturition reflex is 300-400 ml 2. Receptor: Stretch receptors in bladder wall 3. Afferent: Pelvic parasympathetic

What part of the brain is responsible for micturition?

Physiologically, micturition involves the coordination of the central, autonomic, and somatic nervous systems. The brain centers that regulate urination include the pontine micturition center, the periaqueductal gray, and the cerebral cortex, which cause both involuntary and voluntary control over micturition.

What is micturition and how is it regulated?

Micturition, or urination, occurs involuntarily in infants and young children until the age of 3 to 5 years, after which it is regulated voluntarily.