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made out of your heart seriously its true
No, only the heart is made up of cardiac tissue.
wood, metal, *nylon, steel, plastic *for strings
Most classical guitar strings are made from a sort of nylon material. Some expensive types of 6 or 12 string guitars used for Mexican music use steel strings.
the heart is made from many materials such as muscle.
They use seal/walrus/etc. hides and sew them into clothes with thread made from tendons (the strings that move your fingers and toes).
Tendons connect muscles to bone at the muscle's origin or it's insertion. They are made up of connective tissue, which is a tough fibrous material rich in collagen. Similar material connects bones with each other, except the name is different: those are ligaments.
Violin strings can be made out of a variety of material. Metal strings are very common such as aluminium or steal. Nylon strings are also avalible. Originally, when violins where first invented, the strings where made out of a thread of cats gutt wound very tightly but it is very hard to get cats gutts strings now.
tendons and cartilage are made of collagen tissue
It is not recommended since they are of different gauges and are made of different material.
no cause strings like yarn, they are made of totally different material than paper
The two most notable items would be the nut/bridge material and the strings. Today, many of the nut/bridges are made from a high density plastic rather than bone. Most strings are made of nylon, with special combinations of additives, rather than the original wire or gut strings.