Question

The wall of urinary bladder has a thick layer of smooth muscle called
A) Dartos
B) Detrusor
C) Deltoid
D) Depressor

Answer 1

Digestion is the process by which complex molecules present in food are broken down into simple molecules so that it can readily be absorbed by the body.

Complete answer:
Let us first know more about the urinary bladder.Urinary bladder is a sac-like structure whose primary function is to store urine.The urinary bladder is made up of smooth muscles and can expand in order to store urine.

Option A: Dartos is found in the scrotal sac.It helps in regulation of temperature of the testicles, thereby helping in promoting spermatogenesis.But it is not found in the urinary bladder, therefore, this is the incorrect option.
Option B: Detrusor muscles are found in the wall of the urinary bladder.The muscles remain relaxed so that urine can be stored in the urinary bladder, and it contracts during urination in order to release urine.The urinary system has two sphincters- external and internal sphincters.Therefore, this is the correct option.
Option C: Deltoid muscle is found in the upper arm.It is triangular muscle which helps in the movement of the arm.But it is not found in the urinary bladder, therefore, this is the incorrect option.
Option D: Depressor muscle is found in the face.It originates from the mouth and is associated with frowning of the face.But it is not found in the urinary bladder, therefore, this is the incorrect option.

Thus, the correct answer is option (B) Detrusor.

Note: The urinary bladder has two sphincters- external and internal sphincter.The internal sphincter along with detrusor muscles are under autonomic control.But external sphincters are under voluntary control.