Tag: reproductive system of human

Questions Related to reproductive system of human

Release of egg from ovary is called

female reproductive structure reproductive system of human hormones, homeostasis, and reproduction human physiology biology

  1. Ovipary

  2. Ovulation

  3. Hatching

  4. All of the above

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Correct Option: B
Explanation:

The release of an egg from the ovary is called ovulation. This process occurs in the ovulatory phase of the menstrual cycle when the secondary oocytes forms Graafian follicle which then ruptures to release the ovum. The ovulation in human females occurs under the influence of luteinizing hormone LH.

How many eggs will be formed from an ovary of a woman, in absence implantation of an embryo?

female reproductive structure reproductive system of human hormones, homeostasis, and reproduction human physiology biology

  1. $12$

  2. $06$

  3. $24$

  4. $48$

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Correct Option: A

$32$ celled stage of human embryo is?

female reproductive structure reproductive system of human hormones, homeostasis, and reproduction human physiology biology

  1. Smaller than fertilized egg

  2. Same size of fertilized egg

  3. Two times the size of fertilized egg

  4. Four times the size of fertilized egg

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Correct Option: A

Synergids in female gametophyte.

female reproductive structure reproductive system of human hormones, homeostasis, and reproduction human physiology biology

  1. Are present towards chalazel end x

  2. Has micropylar nucleus

  3. Also known as vegetative cells

  4. Have filiform apparatus at chalazal end

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Correct Option: A

Fertilizins are emitted by

female reproductive structure reproductive system of human hormones, homeostasis, and reproduction human physiology biology

  1. Immature eggs

  2. Mature eggs

  3. Sperms

  4. Polar bodies

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Correct Option: B
Explanation:

Mature egg secretes a chemical known as fertilizin, which is composed of glycoprotein (monosaccahride and fatty acid substance). Sperm has on its surface a protein substance known as antifertilizin, which is composed of acidic amino acids. The fertilizin and antifertilizin interacts together and this interaction makes the sperms stick to the egg surface. Hence, option B is correct answer.

Ovulation hormone is 

female reproductive structure reproductive system of human hormones, homeostasis, and reproduction human physiology biology

  1. FSH

  2. ICSH

  3. LH

  4. Testosterone

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Correct Option: C
Explanation:

The average length of the menstrual cycle is about 28 days. By convention the days of the cycle are numbered from the beginning of the menstrual phase of the menstrual cycle, which usually lasts about 4 days. This is followed by the proliferative phase (about 10 days), then by the secretory phase (about 14 days). 

The secretion of gonadotropins (LH and FSH) increases gradually during the follicular phase, and stimulates follicular development as well as secretion of estrogens by the growing follicles. Both LH and FSH attain a peak level in the middle of cycle (about 14th day). Rapid secretion of LH leading to its maximum level during the mid-cycle is called as LH surge, induces rupture of Graafian follicle and thereby the release of ovum (ovulation).

In mammals the female secondary sexual characters are developed mainly by the hormone

female reproductive structure reproductive system of human hormones, homeostasis, and reproduction human physiology biology

  1. Relaxin

  2. Estrogens

  3. Progesterone

  4. Ganadotropins

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Correct Option: B
Explanation:

Estrogens are the primary female sex hormones. They promote the development of female accessory/secondary sexual characteristics, such as breasts, and are also involved in the thickening of the endometrium and other aspects of regulating the menstrual cycle.

Estrogen is secreted by

female reproductive structure reproductive system of human hormones, homeostasis, and reproduction human physiology biology

  1. Ovary

  2. Membrana granulosa of Graafian follicle

  3. Germinal epithelium of ovary

  4. Pituitary

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Correct Option: B
Explanation:

A cross section of ovary reveals a cortex and a vesicular medulla. The cortex contains round epithelial vesicle or follicles; follicles are actual center of ovum production or oogenesis. Each primary oocyte is surrounded by a layer of granulosa cells and then called the primary follicle. Follicles are usually located directly beneath the cortex of the ovary. They secret estrogen. But once they begin to mature, they migrate towards the inner medulla. The medulla consists of layers of soft stromal tissue. The stromal tissue contains rich supply of blood vessels, nerves and lymph vessels.

In uterus, endometrium, proliferates in response of

female reproductive structure reproductive system of human hormones, homeostasis, and reproduction human physiology biology

  1. Relaxin

  2. Oxytocin

  3. Progesterone

  4. Estrogen

  5. LH

Show answer
Correct Option: C,D
Explanation:

In humans, the menstrual cycle starts with the menstrual phase, when menstrual flow occurs and it lasts for 3-5 days. The menstrual flow results due to breakdown of endometrial lining of the uterus and its blood vessels which forms liquid that comes out through vagina. Menstruation only occurs if the released ovum is not fertilised. 

The menstrual phase is followed by the follicular phase. During this phase, the primary follicles in the ovary grow to become a fully mature Graafian follicle and simultaneously the endometrium of uterus regenerates through proliferation. These changes in the ovary and the uterus are induced by changes in the levels of pituitary and ovarian hormones. The secretion of gonadotropins (LH and FSH) increases gradually during the follicular phase, and stimulates follicular development as well as secretion of estrogens by the growing follicles. Both LH and FSH attain a peak level in the middle of cycle (about 14th day). 
Rapid secretion of LH leading to its maximum level during the mid-cycle called LH surge induces rupture of Graafian follicle and thereby the release of ovum (ovulation). The ovulation (ovulatory phase) is followed by the luteal phase during which the remaining parts of the Graafian follicle transform as the corpus luteum. 
The corpus luteum secretes large amounts of progesterone, which is essential for maintenance of the endometrium. Such an endometrium is necessary for implantation of the fertilised ovum and other events of pregnancy. During pregnancy all events of the menstrual cycle stop and there is no menstruation. In the absence of fertilisation, the corpus luteum degenerates. This causes disintegration of the endometrium leading to menstruation, marking a new cycle. In the monthly menstrual cycle, the uterus undergoes cyclical changes of growth and degeneration. 
Estrogens produced from the developing follicles stimulate endometrial growth, and progesterone is responsible for converting the estrogen-primed endometrium into a receptive state. 

Number of eggs released in the life time of a woman is approximately

female reproductive structure reproductive system of human hormones, homeostasis, and reproduction human physiology biology

  1. 40

  2. 400

  3. 4000

  4. 20000

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Correct Option: B
Explanation:

When a woman is born there are usually one million eggs in each ovary and one egg will be released, when she ovulates every month during her menstrual cycle, which is approximately 400-500 eggs over her lifetime. As a woman gets older the rest of the eggs disappear, break down or deteriorate and by the time she reaches menopause, there are no eggs left. Thus, the correct answer is option B.