Spongy.
The heart
Smooth Muscle
back muscle
Heart
Aortic valve
The smooth muscle is used in all hollow organs.
No
Their principal function is to transport oxygen from the atmosphere into the bloodstream, and to release carbon dioxide from the bloodstream into the atmosphere. This exchange of gases is accomplished in the mosaic of specialized cells that form millions of tiny, exceptionally thin-walled air sacs called alvioli
yes because organs are made up of tissues and so are muscles and for the lungs to move they need the muscle. So yes your lungs do have muscles.
SmooTh muscle
The muscle is the "diaphragm" muscle. It is located beneath the lungs. When it moves down and away, it creates lower pressure around the lungs, and the air pressure outside the body flows into the lungs. When it moves up and in, it compresses the lungs, increasing the pressure to force the air back out.