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प्रश्न
Why does menstruation occur?
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उत्तर
Menstruation is a process in which blood and mucous flow out every month through the vagina. This process occurs every month because one egg is released from the ovary every month and at the same time, the uterus (womb) prepares itself to receive the fertilised egg. Thus, the inner lining of the uterus gets thickened and is supplied with blood to nourish the embryo. If the egg does not get fertilised, then the lining of the uterus breaks down slowly and gets released in the form of blood and mucous from the vagina. It lasts for three to five days.
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संबंधित प्रश्न
What happens in a girl’s body under the influence of hormones?
The following diagram represents the vertical sectional view of the human female reproductive system.
Label the parts indicated by the guidelines 1 to 8.
Choose the correct answer:
Ovum is a ______________
The diagram alongside is the vertical section of female reproductive organs. Study the diagram and answer the questions that follow:
(i) Name the fully developed part of ovary containing the ovum.
(ii) Name the organ of the female body in which the foetus develops.
(iii) What is ovulation?
(iv) Which two hormones are secreted by ovary?
Name the following:
The organ of female in which the foetus develops.
What is true of gametes?
Estrogen is secreted by ______
The implantation of the embryo occurs at about ______ days of fertilization.
After birth, colostrum is released from mammary glands which is rich in ______.
To answer the question, study the graphs below for Subjects 1 and 2 showing different levels of certain hormones.
Which of the following statements is true about the subjects?
Read the following and answer from given below:
Oogenesis is the process of the formation of an ovum in the ovaries. It consists of three phases: multiplication, growth, and maturation. Oogenesis is controlled by hormones GnRH, LH, FSH. GnRH secreted by the hypothalamus stimulates the anterior lobe of the pituitary gland to secrete LH and FSH.
Identify the functions of LH.
- Release of a secondary oocyte from Graafian follicle.
- Stimulates corpus luteum to secrete progesterone.
- Stimulates estrogen formation.
- Promotes development of egg to form secondary oocyte.
What changes are observed in the uterus if fertilisation does not occur?
In rabbits, humans and other placental mammals, fertilization occurs in ______.
Capacitation occurs in:
What are the functions of the ovaries and uterus in the female reproductive system?
The vaginal orifice is covered by a fold of membrane called hymen ______.
Name these:
2 hormones secreted from the corpus luteum.
Write the specific location of the following:
Uterus
Distinguish between the following pair:
Spermatogenesis and oogenesis
