The ileo-cecal (I-C) valve or sphincter controls the passage of digestive material from the Ileum (small intestine) into the cecum (large intestine).
First of all the reason the graph would be a curve is because, as the time increases the position changes, at first the ball is at a certain point then it starts rolling off a cliff so its moving foward and then the ball starts falling, (If too confusing here is a image http://www.mazzworld.net/U11Image1.gif)
Answer is C. Somatic is voluntary component and autonomic is the involuntary component of the peripheral nervous system.
