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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
Define the Zygote.
Suppose a normal woman has never borne a child; How many mature eggs would she have produced in her lifetime? Your calculation should be based on two clues-
(a) Eggs are produced at the rate of 1 egg every 28 days (one menstrual cycle)
(b) A woman’s total reproductive period is 13 – 45 years.
The middle piece of sperm provides:
The figure given alongside represents the female reproductive system of a mammal.
Name the parts labelled A - D
Name the following:
Fusion of sperm and ovum.
Name the following:
Virgin birth
The diagram given below is that of a developing human foetus in the womb. Study the same and answer the question that follow:
Mention two functions of the parts labelled '2' other than its endocrine functions.
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
Gametes have a haploid (n) number of chromosomes.
Differentiate
Isogametes and Heterogametes.
Give a labeled structure of ovum.
Explain the term Cowper’s glands.
Write the functional activity of the following structure:
Prostate gland
Give scientific reason.
The new individual produced by sexual reproduction always has the recombined genes of both the parents.
Sperms undergo the following changes in the epididymis EXCEPT ______
State whether True or False:
The chromosome number in germ cells producing the gametes are diploid.
Name the parts of fallopian tubes.
