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प्रश्न
How many eggs are released by a human ovary in a month? How many eggs do you think would have been released if the mother gave birth to identical twins? Would your answer change if the twins born were fraternal?
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उत्तर
Each ovary produces several immature eggs, which are connected with groups of other cells known as follicles. In humans, only one egg is usually removed at a time; however, two or more may emerge during the menstrual cycle. The egg emerges from the ovary between the 14th and 16th days of the typically 28-day menstrual cycle. Fertilisation of a single egg results in one zygote (monozygotic) that divides into two embryos, forming identical twins. If the twins were born fraternal, two eggs would be released. Fraternal twins (also known as non-identical twins) are typically formed when two fertilised eggs are implanted in the uterine wall at the same time. The two eggs produce two zygotes; hence, these twins are also known as dizygotic or binovular twins.
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संबंधित प्रश्न
Name the function of the following:
Sperm tail
Describe the human female reproductive system with a labelled diagram.
Mention the functions of Ovary.
Give appropriate term of the following:
The monthly discharge of blood and disintegrated uterine tissues in human female.
The diagram alongside is the vertical section of female reproductive organs. Study the diagram and answer the questions that follow:
- Name the fully developed part of ovary containing the ovum.
- Name the organ of the female body in which the foetus develops.
- What is ovulation?
- Which two hormones are secreted by ovary?
Name the following:
The separation of the foetus from the mother's body.
Given here is a section of the female reproductive system of human beings.
Name the part where fertilisation occurs in human beings.
Name the Following
A cellular sac containing maturing egg.
State the Location:
Ovary
Write the functional activity of the following structure:
Ovary
Which of the following is/are included in the external genitalia of the female reproductive system?
A sac shaped like an upside down pear with a thick lining and muscles in the pelvic area where a fertilized egg or zygote comes to grow into a baby is called ______.
The estrus cycle is a characteristic of ______.
Bartholin’s glands are situated ______.
The external genitalia of the human female is called ______.
The finger-like projections, called fimbriae, help in the collection of ovum into the fallopian tube following ovulation.
To answer the question, study the graphs below for Subjects 1 and 2 showing different levels of certain hormones.
Which of the following statements is true about the subjects?
Read the following and answer from given below:
Oogenesis is the process of the formation of an ovum in the ovaries. It consists of three phases: multiplication, growth, and maturation. Oogenesis is controlled by hormones GnRH, LH, FSH. GnRH secreted by the hypothalamus stimulates the anterior lobe of the pituitary gland to secrete LH and FSH.
Which hormone induces the rupture of the mature Graafian follicle?
Read the following and answer from given below:
Oogenesis is the process of the formation of an ovum in the ovaries. It consists of three phases: multiplication, growth, and maturation. Oogenesis is controlled by hormones GnRH, LH, FSH. GnRH secreted by the hypothalamus stimulates the anterior lobe of the pituitary gland to secrete LH and FSH.
Identify the functions of LH.
- Release of a secondary oocyte from Graafian follicle.
- Stimulates corpus luteum to secrete progesterone.
- Stimulates estrogen formation.
- Promotes development of egg to form secondary oocyte.
What is placenta? Mention its role during pregnancy?
Anterior lobe of pituitary secretes:
What is the other name for fallopian tubes?
What is the role of cervix in the human female reproductive system?
Given below are the structural details of a human mammary gland:
- The glandular tissue in the breast has 15-20 clusters. of cells called alveoli.
- The milk is stored in the lumen of the alveoli.
- The alveoli join to form the mammary ducts.
- Mammary ampulla is connected to lactiferous ducts.
Choose the option that gives the correct detail of the human mammary gland.
The ______ is also called the womb.
The diagram given below shows a section of the human ovary.
- Name the process for the release of the part labelled 1.
- Write the name of the structure marked 2.
The figure given below is the human female reproductive system. Study the same and answer the following questions.
- Label the guidelines 1 to 6 shown in the figure.
- What is the normal gestation period in human?
- Where are the sperms released during coitus?
- Write two important functions of part 2.
- Mention the technical term for the fixing of developing zygote to the uterine wall.
Complete the analogy with respect to reproductive system.
Male : Penis : : Female : ______.
Which organs are the primary sex organs of the female reproductive system?
