Question

The internal urethral sphincter is composed of ____(1)_____ , while the external urethral sphincter is composed...

The internal urethral sphincter is composed of ____(1)_____ , while the external urethral sphincter is composed of ____(2)____. In order to urinate, both must relax.

a) skeletal muscle

b) smooth muscle

c) cardiac muscle

Science   Anatomy-And-Physiology   
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Answer #1

The internal urethral sphincter is composed of SKELETAL MUSCLE , while the external urethral sphincter is composed of SMOOTH MUSCLE. In order to urinate, both must relax.

The skeletal muscles have involuntary and the smooth muscles have voluntary controls.

Hence, the internal urethral sphincter regulates involuntary control of urine flow from the bladder to the urethra(due to the presnce of skeletal muscle) and the external urethral sphincter provides voluntary control of urine flow from the bladder to the urethra(due to the presence of smooth muscles).

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