Question

Fill in the blanks with appropriate words.
During micturition, the urinary bladder.......... and the urethral sphincter ..........

Answer 1

Micturition is the act of voiding the urine. The release of urine occurs by the contraction of smooth muscles of the urinary bladder wall and relaxation of skeletal muscle sphincter around the opening bladder. As the bladder wall is stretched by the gradual filling of the bladder, a stretch receptor in the wall of the bladder generate nerve impulses. These impulses are carried by sensory neurons to the spinal cord and brain, producing the sensation of fullness. The sphincter then released by the inhibition of motor impulses allowing the smooth muscle of the bladder wall to contract under autonomic control and empty the content.

So the correct answer is contracts, relax.