Transcript Presentación de PowerPoint

https://www.youtube.com/watch?v=jxk5tFiGVSE
He first had to build the bones that the muscles attach to. For this, he used
a cardboard tube from a roll of wrapping paper and cut out a piece the
length of his humerus bone.
Then he measured his forearm and cut out another piece of cardboard to
match. He cut this forearm piece in half lengthwise and taped them
together to form 2 more narrow bones – his radius and ulna bones.
He labeled his bone model carefully. He straightened out a paper clip
and punched it through the ends of his pieces of bones to connect
them, just like a joint would do. He attached the forearm bones
together with a rubber band in place of a wrist.
MAKE A MUSCLE
To make the muscles for his model, Nicholas used two long red balloons – the
skinny ones you use to make balloon animals. He blew them up just slightly and
pressed the air to the center of the balloon, leaving lots of unused balloon on
either end. Next he tied each of the ends of the balloons to his bones to form the
bicep and tricep muscles of his model.
Now he has his own model of a muscle that he can use to demonstrate how the
bicep muscle extends when the arm is straight and how the muscle contracts
when the forearm is pulled up.