Many species are similar, if common names are used people will get confused
During Stage A the muscles and tendons are working in unison to pull the leg backward and upward. In Stage B the tendons are being stretched and the muscles in the leg are driving forward, releasing their pent up energy (the muscles will burn oxygen until they run out at which point they will start producing lactic acid to keep providing energy for the leg, which is why your muscles burn when they are tired)
The pholem tissue, supports the process of translocation.
Xylem tissue is important is the transport of water and minerals from the roots to the leaves of the plant. It is this water that is used in photosynthesis and also significant in the transpirational pull that significant in plant support. When the xylem is destroyed the plant wilts because it loses turgidity and dies because water is unable to reach the leaves for photosynthesis so the plant cannot make its food.