When a human female reaches a certain age then vaginal bleeding occurs for a few days after regular time intervals.
(a) What is this process known as (i) in scientific terms, and (ii) in everyday language?
(b) At what approximate age this process starts in human females? What is the human female said to have attained at this stage ?
(c) After how much time is this process repeated? For how many days this process usually lasts?
(d) What does the onset of this process in human females signify?
(e) At which particular event in the life of a human female this process stops temporarily but starts again?
(f) At which approximate age of human female this process stops permanently ?
(a) (i) Menstruation (ii) Periods
(b) Menstruation starts at the age of 12-14 years. The state at which human female attains this stage is called puberty.
(c) It is lasts usually for 3 to 5 days.
(d) Menstruation in human females signifies that the reproductive system of human female has started working.
(e) Menstruation stops temporarily at the beginning of pregnancy.
(f) Menstruation stops permanently at the age of 45-50.