Question

Urinary bladder : It is a median .............. sac. A
hollow muscular organ, the bladder is situated in pelvic
cavity posterior to public symphysis. At the base of the
... there is a small inverted triangular area called
Trigone. At the apex of this triangle is opening of ure-
thra. At the two points of the base of the triangle are
openings of ureters. Urinary bladder is covered exter-
nally by peritoneum. Inner to peritoneum is muscular
layer. It is formed by detrusor muscles which consist of
three layers of smooth muscles. Longitudenal -circu-
lar-longitudenal respectively. Innermost layer is made
up of transitional.............. It helps bladder to stretch.​

Answer 1

Answer:

1. muscular sac. 2.mucosa.

Answer 2

Urinary bladder : It is a median .............. sac. A  hollow muscular organ, the bladder is situated in pelvic  cavity posterior to public symphysis. At the base of the  ... there is a small inverted triangular area called  Trigone. At the apex of this triangle is opening of urethra. At the two points of the base of the triangle are openings of ureters. Urinary bladder is covered externally by peritoneum. Inner to peritoneum is muscular  layer. It is formed by detrusor muscles which consist of  three layers of smooth muscles. Longitudinal -circular-longitudinal respectively. Innermost layer is made  up of transitional.............. It helps bladder to stretch.​

Explanation:

Urinary bladder : It is a median distensible sac. A  hollow muscular organ, the bladder is situated in pelvic  cavity posterior to public symphysis. At the base of the urinary bladder  there is a small inverted triangular area called  Trigone. At the apex of this triangle is opening of urethra. At the two points of the base of the triangle are openings of ureters. Urinary bladder is covered externally by peritoneum. Inner to peritoneum is muscular  layer. It is formed by detrusor muscles which consist of  three layers of smooth muscles. Longitudinal -circular-longitudinal respectively. Innermost layer is made  up of transitional epithelium It helps bladder to stretch.​

The urinary bladder receives urine from the kidneys and stores it for excretion. The lower opening has a sphincter muscle which relaxes to release the urine.