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प्रश्न
What is placenta? What is its function?
उत्तर १
Placenta is a disc-like tissue that develops between the uterus wall and the embryo. It helps the embryo in meeting its requirements from the mother.
उत्तर २
Placenta is a special disc-like organ that develops in the fourth week of pregnancy. It establishes an intimate connection between the foetal membrane and the uterine wall via umbilical cord.
Function of Placenta:
The exchange of materials between the blood of mother and foetus takes place through placenta. It provides nutrition to the foetus. It also serves as the respiratory (by allowing exchange of oxygen and carbon dioxide) and excretory organs (by allowing excretion of waste material of foetus into mother's blood) of the foetus.
संबंधित प्रश्न
State its functions in case of a pregnant human female.
How many pairs of chromosomes are present in human beings? Out of these how many are sex chromosomes?
Where is the male gamete formed in humans?
What is gestation period? How much is the gestation period in humans?
fertilisation in humans can occur only once in a month. Why?
What is the life support system of a fetus?
What joins embryo to placenta in mother's body?
When a human female reaches a certain age then vaginal bleeding occurs 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? When is the human female said to have attained at this stage?
(c) After how much time is this process repeated? For how many days does this process usually last?
(d) What does the onset of this process in human females signify?
(e) At which particular event in the life of a human female does this process stop temporarily but start again?
(f) At which approximate age of human female does this process stop permanently?
Answer the following question:
Why are family planning measures needed in our country?
Choose the Odd One Out:
