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प्रश्न
Answer the following question.
What is capacitation? Give its importance.
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उत्तर
Capacitation generally requires 5-6 hours during which the acrosome membrane becomes thin, Ca++ enters the sperm, and sperm tails begin to show rapid whiplash movements.
As a result of capacitation, sperms become extra active and begin to start moving upwards from the vagina to the uterus and to the oviducts. Prostaglandins activate the sperms. The vestibular secretions of the female also enhance sperm's motility. The sperms swim at an average speed of 1.5 to 3.0 mm/min and reach the ampulla. The contraction of uterus and fallopian tubes stimulated by oxytocin of females also aids in the movement of sperm. After capacitation the sperms may reach the ampulla within 5 minutes.
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संबंधित प्रश्न
Name the following:
The fully developed part of the ovary containing a mature egg.
Rewrite the correct statement by changing the last one word if these statement is false.
Pregnancy in women can be prevented by the method of vasectomy.
Give appropriate term of the following:
The attachment of developing zygote (blastocyst) on the uterine wall.
Define the following:
Spermatogenesis
The diagram given below is that of a developing human foetus in the womb. Study the same and answer the question that follow:
Name (any one) hormone produced by the part labelled '2'.
The figure given below represents the female reproductive system of a mammal.
What will happen if the part B on both sides gets blocked?
Where does fertilization occur?
Give Reasons
Millions of sperms are produced at ejaculation yet one sperm actually fertilizes the ovum. Explain.
Give Technical Term:
In how many weeks fetus development is completed?
Explain the process of fertilization.
How many hours are required for the process of capacitation?
Which of the following is the first cell of human life?
State whether the following statement is True or False. If false, correct the statement:
Human egg has a head, middle piece and tail.
How long after ovulation can the ovum be fertilized?
What is karyogamy, also known as amphimixis?
What is the term used to describe the fusion product of male and female pronuclei?
What is the diameter of the human ovum?
