a fence or a wall
Barrier is a word for wall. Other synonyms include barricade, divider and obstruction.
Fresco or mural
there is no other word for cell wall. But cell membraneis the cell wall for animal cells.And cell wall is for only plant cells.
It is the big ladel.
* * * * *
Big is a synonym for important.
Another word for 'happy' is 'elated.'
Another word for myocardium is the heart muscle. The myocardium is the middle and thickest layer of the heart wall.