When a human female reaches a certain age then vaginal bleeding occures 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 as this process repeated ? For how many days this process usually lasts?
(d) What does the onset of this process in human signify?
(e) At which particular event in the life of a human female this process stops temporarily but starts again
(f) At which approximate event in the life of a human female this process stops permanently?

Answer

(a) (i) Mestruation (ii) Periods (b) 10 to 12 years ; Puberty (c) 28 days ; About 3 to 5 days (d) That the reproductive system of human female has started working (e) Beginning of pregnancy (f) About 45 to 50 years