Find the correct steps for micturition (arrange in order)....

Find the correct steps for micturition (arrange in order). (A) Urine filled in urinary bladder (B) Stretch-receptor activation (C) Wall of bladder send signal to CNS (D) Motor message from CNS to urinary bladder and urethral sphincter (E) Bladder contracts and sphincter dilates leads to micturition (a) $\mathrm{A} \rightarrow \mathrm{B} \rightarrow \mathrm{C} \rightarrow \mathrm{D} \rightarrow \mathrm{E}$ (b) $\mathrm{C} \rightarrow \mathrm{B} \rightarrow \mathrm{A} \rightarrow \mathrm{D} \rightarrow \mathrm{E}$ (c) $\mathrm{B} \rightarrow \mathrm{A} \rightarrow \mathrm{C} \rightarrow \mathrm{D} \rightarrow \mathrm{E}$ (d) $\mathrm{A} \rightarrow \mathrm{B} \rightarrow \mathrm{C} \rightarrow \mathrm{E} \rightarrow \mathrm{D}$

Find the correct steps for micturition (arrange in order).
(A) Urine filled in urinary bladder
(B) Stretch-receptor activation
(C) Wall of bladder send signal to CNS
(D) Motor message from CNS to urinary bladder and urethral sphincter
(E) Bladder contracts and sphincter dilates leads to micturition
(a) $\mathrm{A} \rightarrow \mathrm{B} \rightarrow \mathrm{C} \rightarrow \mathrm{D} \rightarrow \mathrm{E}$
(b) $\mathrm{C} \rightarrow \mathrm{B} \rightarrow \mathrm{A} \rightarrow \mathrm{D} \rightarrow \mathrm{E}$
(c) $\mathrm{B} \rightarrow \mathrm{A} \rightarrow \mathrm{C} \rightarrow \mathrm{D} \rightarrow \mathrm{E}$
(d) $\mathrm{A} \rightarrow \mathrm{B} \rightarrow \mathrm{C} \rightarrow \mathrm{E} \rightarrow \mathrm{D}$

Key Concepts

Urinary Bladder Filling and Storage

This concept refers to the process by which urine is collected and temporarily stored in the urinary bladder. It highlights the bladder's capacity to expand as urine accumulates, which is an essential precursor to initiating the micturition reflex once a certain volume is reached.

Mechanoreceptors Activation

Stretch receptors located in the bladder wall are activated by the distention caused by the filling process. Their activation is a critical step that signals the need to initiate micturition once the bladder reaches a threshold of fullness.

Afferent Signal Transmission

Upon activation of the stretch receptors, sensory (afferent) signals are sent from the bladder wall to the central nervous system. This communication informs the brain about the state of bladder filling and is vital for triggering the subsequent reflexes involved in micturition.

Central Nervous System Integration

The central nervous system processes the incoming signals from the bladder to determine the appropriate response. This integration of information leads to the decision to initiate the voiding process, coordinating the balance between storage and elimination of urine.

Efferent Motor Response and Micturition Reflex

Following CNS integration, motor (efferent) signals are transmitted back to the urinary bladder and urethral sphincter. This response triggers the contraction of the bladder muscle (detrusor) and the dilation or relaxation of the urethral sphincter, resulting in the coordinated process of micturition.

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