Question

The detrusor muscle is thickened near the urethra to form an internal urethral sphincter which compresses the urethra and retains urine in the bladder. This sphincter is composed of ------- muscle.

1. Endothilium of the capillary
2. Basement membrane
3. Podocytes & filtration slits Molecule
4. smooth

Answer 1

The internal urethral sphincter is composed of smooth muscle and works in coordination with the detrusor muscle to control the storage and release of urine.

Step-by-step explanation:

The internal urethral sphincter is thickened near the urethra to retain urine in the bladder and it is composed of smooth muscle. The detrusor muscle, also made up of smooth muscle fibers, relaxes as the bladder fills with urine, and contracts during urination to expel urine out of the bladder and into the urethra. This muscle coordination is orchestrated by both the autonomic and somatic nervous systems, enabling the controlled storage and release of urine.