lumen
The urinary bladder is a hollow organ, which means it has empty space inside that can expand to store urine.
Viscus means organ. So hollow viscus means an organ than has a lumen or open space within it, like the stomach and intestines. Perforated hollow viscus is an organ with a lumen that has a hole in it such that contents can escape from inside the organ to outside the organ. If a gastric ulcer perforated, it would be a perforated hollow viscus, allowing gastric acid and contents out into the abdominal cavity.
marrow
a cavity,opening,or space within somethingwhen something is hollow t has nothing inside it (when a tree is hollow it is empty)
ventricles
Hollow.
a cavity,opening,or space within somethingwhen something is hollow t has nothing inside it (when a tree is hollow it is empty)
The word hollow is an adjective. It means to have an empty space inside.
a cavity,opening,or space within somethingwhen something is hollow t has nothing inside it (when a tree is hollow it is empty)
A hollow object is one that has empty space inside it. These objects are often lightweight and can be used for various purposes such as storage, transportation, or as a container for other items. The hollow space inside the object can also provide insulation or reduce the overall weight of the object.
The empty space inside a tube is called the lumen. It is the hollow part through which fluid or air can flow.
The hollow core of a needle is called the lumen. It is the open space inside the needle through which fluids are drawn or injected.