The uterus is a very muscular and stretchy organ in which babies grow during pregnancy.

The tongue is a muscular organ in the mouth.

The uterus is a hollow, muscular organ in a woman's pelvis.

The stomach is a muscular organ located on the left side of the upper abdomen.

The heart is a hollow, muscular organ that maintains blood circulation throughout the body.

Over a period of time these muscles, including the heart which is a muscular organ, become more efficient.

They are named for a muscular organ found under the chin of males.

The heart is a muscular organ about the size of a fist, located just behind and slightly left of the breastbone.

The uterus, the muscular organ that holds the developing fetus, can expand up to 20 times its normal size during pregnancy.

Your heart has got nothing to do with this, by the way, it's merely a muscular organ which powers the circulation of the blood.