The bladder.
Amniotic sac
Amniotic sac
The bladder is a sac-like organ in the body where urine is collected before being excreted through the urethra. The bladder expands as it fills with urine and contracts to release the urine when necessary.
A sac-like organ is a structure in the body that is shaped like a pouch or bag. Examples include the gallbladder, which stores bile; the urinary bladder, which collects urine; and the intestines, which have sac-like segments for digestion and absorption. These organs often have elastic walls that can stretch to accommodate and store various substances.
Marsupial sac.
The bladder.
It's an Air Sac.
The urinary bladder acts as a storage sac for urine in the body.
Amniotic sac
Amniotic sac
I Think You Thinking Of The Alveoli/Alveoli's
gallbladder
The bladder is a sac-like organ in the body where urine is collected before being excreted through the urethra. The bladder expands as it fills with urine and contracts to release the urine when necessary.
A sac-like organ is a structure in the body that is shaped like a pouch or bag. Examples include the gallbladder, which stores bile; the urinary bladder, which collects urine; and the intestines, which have sac-like segments for digestion and absorption. These organs often have elastic walls that can stretch to accommodate and store various substances.
The scrotum protects the oval-shaped testicle.
The Stomach