Question

Inner wall of the urinary bladder is composed of
A. Unstriped muscles
B. Striped muscles
C. Stratified epithelium
D. Transitional epithelium

Answer 1

Hint:Urinary bladder is a part of the excretory system. It is used to store the urine until it is passed out. It is a median pyriform sac that varies in position size and shape according to the amount of urine contained in it.

Complete answer:
The walls of the urinary bladder consist of three coats. These three coats are the outer adventitia, the middle muscular, and the inner mucosa.
Unstriped muscles –
Unstriped muscles are also known as non-skeletal muscles, involuntary muscles, smooth muscles, unstriated muscles, etc. They are a type of muscular tissue. These muscles have longitudinal, spindle-like fibers. Unstriped muscles are uninucleate and they do not have any stripes or striations present. They are found in visceral or internal organs that function involuntarily like the pancreas, liver, erector pili, etc.
Striped muscles –
Striped muscles are also known as skeletal muscles, voluntary muscles, unsmooth muscles, striated muscles, etc. They are a type of muscular tissue. Striped muscles have stripes or striations present. They are found in organs that function voluntarily like the hands, legs, etc.
Stratified epithelium –
The stratified epithelium is a type of epithelial tissue based on the covering. It is also known as the compound epithelium. It has a layer of cells over a single basement layer. The stratified epithelium is found in skin, hair, buccal cavity, pharynx, etc.
Transitional epithelium –
Transitional epithelium is a specialized type of epithelial tissue. It is the layer with the power of contractility. It has no basement layer. It is found in the inner wall of the urinary bladder.
Thus, based on the above information we can conclude that the inner wall of the urinary bladder is composed of transitional epithelium.

Hence, the correct answer is an option (D).

Note: The muscles present in the middle muscular layer are known as the detrusor muscles. These muscles take part in detrusion or the process of passing down urine. This layer has involuntary circular muscles in the middle and involuntary longitudinal muscles on the inner and the outer side. The outer adventitia layer is formed from the soft connective tissue.