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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
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.
Draw a labelled diagram of the female reproductive system.
State the function of Ovary.
State the function of Fallopian tubes.
Given here is a section of the female reproductive system of human beings.
Name the parts labelled 1 to 4
Mention the functions of Ovary.
Rewrite the terms in the correct order so as to be in a logical sequence.
Graafian follicle, ostium, uterus, fallopian tube.
What is hymne?
Differentiate between:
Implantation and pregnancy
Name the following:
The part of the female reproductive system in which fertilization occurs.
Draw a label diagram.
Draw a sectional view of the human ovary showing the different stages of developing follicles, corpus luteum, and ovulation.
Name the Following
The term used when beard and mustache appear, harshening of voice, broadening of shoulders, etc. takes place.
Complete the following sentences with appropriate word:
A hormone secreted in a female to facilitate parturition is ________.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
The cilia lining the oviduct funnel, push the released ovum into the uterus.
State names of organs in the female reproductive system.
Contraction of which muscles are responsible for causing labour during parturition?
Breasts are the modified ______ glands.
Which of the following is ectodermal in origin?
| (i) | Heart |
| (ii) | Sweat glands |
| (iii) | Adrenal medulla |
| (iv) | Middle ear |
| (v) | Urinary bladder |
| (vi) | Dermis of skin |
Identify the odd one from the following.
Cleavage in mammalian egg is ______.
Endometrium undergoes cyclical changes and help in uterine movements.
When the foetus is growing inside the uterus it needs nutrients. Which part provides these nutrients?
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 ______
Which among the following diseases is not sexually transmitted?
What are various ways to avoid pregnancy? Elaborate any one method.
______ acts as a birth canal.
One mature ovum is released once every ______ days.
______ receives the sperms and acts as a birth canal during childbirth.
Match the following:
| Ovaries | Bean shape |
| Fallopian tubes | Almond shape |
| Uterus | Funnel – shape |
| Kidney | pear-shaped |
The vaginal orifice is covered by a fold of membrane called hymen ______.
Given below is a certain situation. Analyze and describe its possible impact on a person:
Egg is not fertilised in a human female.
Sketch and label - Graafian follicle.
The ______ is also called the womb.
What is the length of an ovary?
Female gametes, namely ova/ovum, are produced through which process?
Which statement correctly describes the basic composition of each breast?
Which sequence correctly traces the milk pathway from alveoli to nipple?
