Medical Definition of Z LINE. : any of the dark bands across a striated muscle fiber that mark the junction of actin filaments in adjacent sarcomeres.Britannica.com: Encyclopedia article about Z line.efinition of Z LINE. : any of the dark thin bands across a striated muscle fiber that mark the junction of actin filaments in adjacent sarcomeres. ADVERTISEMENT.
The average fb speed in the MLB is 91-92ish. Catchers compete with this when trying to throw down a runner at 90ish. The average throw speed from third base is 80 MPH. As for the rest of the positions I am not sure of the exact average, but it is not as fast or faster than pitch speed.
The fastest pitch ever was by Detroit Tiger, Fernando Rodney, in a game against the Minnesota Twins. The pitch was 115.7 mph. +1 vote! The fastest recorded pitch during a MLB game was thrown by Joel Zumaya of the Detroit Tigers on October 10th, 2006 against the Oakland A's. The pitch was clocked at 104.8 mph.