The type of muscles that wrap around bones are typically skeletal muscles, but muscles do not make the bones light. What makes bones light are the fact that they are porous. There are a lot of holes within the bones that make it lighter, but those holes make sort of arcs and what not, similar to those in the Eiffel tower, for example. They are light weight, but very strong.
marrow
Because it makes your bones stronger.
If you mean "light" as in "the opposite of being heavy", then: Bird bones are hollow. Well, not completely, but if you look at the structures they are not as "filled up" as, say, human bones.
bird bones are hollow. that is why they are light
sarcomere's are the functional unit of a muscle which contract and make muscles shorter which then cause bones to move.
The human body has three main layers of muscle: the skeletal muscle, which is attached to bones and allows for voluntary movement; the smooth muscle, which is found in the walls of internal organs and is involuntary; and the cardiac muscle, which makes up the heart and is also involuntary. Each type of muscle serves a distinct function within the body.
Calcuim makes your bones and teeth stornger :D
its the same
The Muscle Tissue makes our bones move
All the bones in the human body is made up of calcium.
Bird bones are light because they are hollow.
They have hollow bones.