. M ENSTRUAL C YCLE The reproductive cycle in the female primates (e.g. monkeys, apes and human beings) is called menstrual cycle. The first menstruation begins at puberty and is called menarche .
In human females, menstruation is repeated at an average interval of about / days, and the cycle of events starting from one menstruation till the next one is called the menstrual cycle . One ovum is released (ovulation) during the middle