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प्रश्न
Why does menstruation occur?
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.
APPEARS IN
संबंधित प्रश्न
Draw a diagrammatic sectional view of the female reproductive system of human and label the parts
(i) where the secondary oocytes develop
(ii) which helps in collection of ovum after ovulation
(iii) where fertilization occurs
(iv) where implantation of embryo occurs.
Write two major functions of ovary.
How many eggs do you think were released by the ovary of a female dog which gave birth to 6 puppies?
Put a tick mark (✓) against the correct alternative in the following statement:
Internally, the uterus opens into:
State the function of Fallopian tubes.
Fill in the blank:
Development of baby (foetus) takes place inside __________.
In female, after how much time after fertilization, does the fertilized egg get implanted in the
uterine wall?
Draw a sectional view of the human ovary. Label the following parts :
(ii) Secondary oocyte
(iii) Graafian follicle
(iv) Corpus luteum
The below diagram represents the sectional view of the female reproductive organs of a mammal.
(i) Label the parts numbered 1 to 7.
(ii) What are the main functions of the parts labeled 2, 5, 6?
State the Location:
Bartholin’s glands.
Write the functional activity of the following structure:
Fallopian tubes
Hormones secreted by the ovary of the female reproductive system.
State names of organs in the female reproductive system.
Which of the following is not a part of female reproductive system?
After fertilization the ovary develops into ______.
Name the part of the human female reproductive system where the following occurs.
Fertilization
Womb is used to refer ______.
______ pollen mother cells should undergo meiotic division to produce 64 pollen grains.
Primordial follicle cells undergo mitotic division to produce ______.
During which process is the egg released from the Graafian follicle?
A sac shaped like an upside down pear with a thick lining and muscles in the pelvic area where a fertilized egg or zygote comes to grow into a baby is called ______.
Identify the odd one from the following.
Ovulation occurs under the influence of ______.
Which part of ovary in mammals acts as an endocrine gland after ovulation?
Bartholin’s glands are situated ______.
The embryo in humans gets nutrition from the mother’s blood with the help of a special tissue called ______
Tubectomy is carried out by blocking the ______
Read the following and answer from given below:
During copulation, semen is released by the penis into the vegina. The motile sperms swim rapidly, fuse with the ovum in the ampullary region, resulting in fertilization. The haploid nucleus of sperm fuses with that of the ovum to form a diploid zygote.
Site of fertilization in human is ______
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.
what is the function of hormones FSH?
What changes are observed in the uterus if fertilisation does not occur?
What changes are observed in the uterus subsequent to implantation of young embryo?
Draw a neat diagram of the female reproductive system and label the parts associated with the following:
(a) production of gamete
(b) site of fertilisation
(c) site of implantation
(d) birth canal
With a suitable diagram, describe the organisation of mammary gland.
In which part of the human female reproductive system do the following events take place?
Release of first polar body
______ is not a part of the female reproductive system in human beings.
Explain how the uterus and placenta provide necessary conditions for proper growth and development of the embryo after implantation?
The part of Fallopian tube closest to the ovary is ______.
The ______ is also called the womb.
Rewrite the terms in the correct order so as to be in a logical sequence.
Graafian follicle, ostium, uterus, fallopian tube, ovum.
Define the following term:
Hymen
