Adolescent PregnancyYou might be knowing that in our country, the legal age for marriage is 18 years for girls and 21 years for boys. This is because teenage mothers are not prepared mentally or physically for motherhood. Early marriage and motherhood cause health problems in the mother and the child. It also curtails employment opportunities …
Two chromosomes out of these are the sex chromosomes, named X and Y. A female has two X chromosomes, while a male has one X and one Y chromosome. The gametes (egg and sperm) have only one set of chromosomes. The unfertilised egg always has one X chromosome.
At 45 to 50 years of age, the menstrual cycle stops.Stoppage of menstruation is termed menopause. . Initially, menstrual cycle may be irregular. It take some time to become regular.
The first menstrual flow begins at puberty at the age of 13 -16 years in female and is termed menarche.
Solution : If fertilisation does not occur, the released egg and the thickened lining of the uterus along with its blood vessels are shed off. This causes bleeding in women which are called menstruation. Menstruation occurs once in about 28 to 30 days.
Endocrine glands release hormones into the bloodstream to reach a particular body part called target site.The target site responds to the hormone.
Pituitary gland is called the master gland because it produces hormones that control other glands of our body.
Once puberty is reached in girls, ovaries begin to produce the female hormone or estrogen which makes thebreasts develop. Milk secreting glands or mammary glands develop inside the breasts.
The male hormone or testosterone begins to be released by the testes at the onset of puberty. This causes changes in boys about which you have just learnt, for example, the growth of facial hair.
female hormone or estrogen
