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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
State whether the following statement is true (T) or false (F):
The plumule of an embryo gives rise to the root system.
Define the term Gamete.
The figure given alongside represents the female reproductive system of a mammal.
Name the parts labelled A - D
State whether the following statement is true or false:
Fertilization occurs in the vagina.
Complete the following statement by choosing the correct alternative:
Fertilization occurs in ______.
The following diagram represents the vertical sectional view of the human female reproductive system.
How does the uterus prepare for the reception of zygote?
The diagram given below is that of a developing human foetus in the womb. Study the same and answer the question that follow:
How many days does the foetus take to be fully developed?
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 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'.
What are the functions of testes?
What is fertilization? Name the site of fertilization in the human females.
Study the diagram given below and then answer the questions that follow:
(i) Name the part labeled A. Name any two hormones produced by the part labeled A.
(ii) What happens to the part labeled B.
(1) if fertilization takes place?
(2) If fertilization does not take place?
(iii) Where does fertilization occur?
(iv) Draw a neat diagram of the human sperm as seen under high magnification and label the following parts.
(1) Acrosome
(2) Mitochondria
Give Technical Term:
In how many weeks fetus development is completed?
Complete the following sentences with appropriate word:
The process of releasing an egg from the ovary is called _________.
Explain the mechanism of fertilization in humans.
State whether True or False:
The chromosome number in germ cells producing the gametes are diploid.
What is sex chromosomes?
Explain tubectomy and vasectomy.
Fertilization takes place in ______.
