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प्रश्न
Answer the following question.
What is capacitation? Give its importance.
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
State whether the following statement is true (T) or false (F):
A fertilised egg becomes a seed.
The middle piece of sperm provides:
What is fertilization? Name the site of fertilization in the human females.
Give Reasons
Gametes have a haploid (n) number of chromosomes.
Give Technical Term:
In how many weeks fetus development is completed?
Complete the following sentences with appropriate word:
One egg is normally released from the ovary in the human females after
__________
In markets, eggs of birds are available but never eggs of dogs, why?
State whether the following statement is True or False. If false, correct the statement :
The eggs of fish are covered by hard shells for protection.
What are autosomes chromosomes?
Give any four significances of fertilization in humans.
