What Do the Straws Strings and Rubber Bands Represent on the Real Hand

Cer 1: What do the straws strings and rubber bands represent on the real hand. 

The straws and rubber bands represent the tendons and ligaments. The straw-hand design shown in this project mimics the way that tendons bend your fingers even though the muscles that control the action are actually in your forearm. To make your finger bend, a muscle pulls on a long string of collagen called a tendon. The tendon connects the muscle to the bone in your finger. It is kind of like remote control: When the muscle pulls, the finger bends at the joint. You will use a drinking straw as both bone and skin, sewing thread as a tendon, and you will provide the muscle. When you have finished this engineering project, you will have made a working robot hand, with multiple fingers that you control just by pulling threads. This mimics a real hand using the same basic concepts a real hand would.

Cer 2 why did u put a palm split on your hand? What does it represent on the real hand?

So that we can scrunch our hands into a fist, or other complex shapes, without excessive stretching or leaving bags of loose skin – think about how much movement occurs when you’re typing, holding a cup or doing chores. The lines are called ‘palmar flexion creases’ and develop before birth. They are caused by muscle movements of our hands. We call them "crease" in anatomy. You can watch them become deeper as you move your hand and finger joints. Those splits we made in our hands are to represent those exact factors. So that our hand can pick up things like glasses and grip things like a grabbling hook at a fun fair or at an arcade. Do essentially we made this cuts so that we can mimic why our hand need these cuts to move.