Intracellular Ca 2+ is a key regulator of cell signaling and sperm are not the exception. Cells
often use cytoplasmic Ca 2+ concentration ([Ca 2+] i) oscillations as a means to decodify
external and internal information.[Ca 2+] i oscillations faster than those usually found in
other cells and correlated with flagellar beat were the first to be described in sperm in 1993
by Susan Suarez, in the boar. More than 20 years passed before similar [Ca 2+] i oscillations
were documented in human sperm, simultaneously examining their flagellar beat in three …