Tag: menustral cycle in human

Questions Related to menustral cycle in human

Milk secreted from the cells of alveoli of mammary lobes reaches nipple through lactiferous duct (L), mammary duct(M), mammary tubule (T) and mammary ampulla (A) in the following order

zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. TMAL

  2. MTLA

  3. MTAL

  4. ATML

Show answer
Correct Option: A
Explanation:
  • Mammary glands or breasts are modified sweat glands that lie over the pectoral muscles. Each breast has a broad multiporous tip called nipple for the release of milk. A circular pigmented area called areola lies below it. Each breast contains 15-20 glandular lobes separated from one another by dense connective tissue and adipose tissue. Each lobe is further made of many lobules having glandular or secretory alveoli.
  • The cells of alveoli produce milk which is stored in the cavities or lumens of alveoli. Alveoli open into mammary tubules and then into mammary ducts. Mammary ducts form a mammary ampulla from which a lactiferous duct develops. Each lobe produces a separate lactiferous duct. The various lactiferous ducts open at the nipple by separate pores.
So, the correct answer is 'TMAL'.

Delivery of developed fetus is scientifically called ______________.

zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. Parturition

  2. Oviposition

  3. Abortion

  4. Ovulation

Show answer
Correct Option: A
Explanation:

Parturition is the act of expelling the full-term young one from the mother's uterus at the end of gestation. Gestation (pregnancy) is completed in about 266 days from the mother's last menstruation.

Given below are three statements each with one or two blanks. Select the option which correctly fills up the blanks in, any two statements.
(A) In human beings, menstrual cycle ceases around 50 years of age; this is termed as  (i) .
(B) The milk produced during the initial few days of lactation is called  (i)  which contains several  (ii)  absolutely essential to develop resistance for the new-born babies.
(C) At the completion of the  (i)  division the primary oocyte divides into secondary oocyte and  (ii) .

zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. (A)-(i) menarche; (B)-(i) lactation, (ii) minerals

  2. (B)-(i) colostrum, (ii) antibodies, (C)-(i) first meiotic, (ii) first polar body

  3. (A)-(i) menopause; (C)-(i) second meiotic, (ii) second polar body

  4. (A)-(i) menopause; (B)-(i) corpus luteum, (ii) antibodies

Show answer
Correct Option: B
Explanation:

The mammary glands of the female undergo differentiation after the pregnancy and starts producing milk towards the end of it, called lactation and the milk produced during these initial few days is referred to as colostrum. This contains many antibodies that is essential for the new born babies to develop resistance against any pathogen attack or disease. During oogenesis the gamete mother cell undergoes meiosis division to form the primary oocyte and this further divides into the secondary oocyte and a polar body by means of an unequal division. 

So, the correct option is ' (B)-(i) colostrum, (ii) antibodies, (C)-(i) first meiotic, (ii) first polar body'.

Intensely lactating mothers do not generally conceive due to the

zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. Suppression of gonadotropins

  2. Hypersecretion of gonadotropins

  3. Suppression of gametic transport

  4. Suppression of fertilization

Show answer
Correct Option: A
Explanation:
Presence of prolactin hormone in the blood of lactating mothers suppresses the release of gonadotropins (FSH and LH) from the pituitary gland. Gonadotropins are required for ovulation to occur. Thus, in the absence of gonadotropins, ovum is not released and hence chances of fertilisation are nil upto 6 months following parturition (if the mother is regularly breast-feeding). Therefore, intensely lactating mothers do not generally conceive.
So, the correct answer is 'Suppression of gonadotropins'.

Which hormone stimulates the secretion of milk from female?

zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. Oxytocin

  2. Progesterone

  3. LH

  4. Prolactin

Show answer
Correct Option: D
Explanation:

 Prolactin hormone is secreted by pituitary gland it stimulates the secretion of milk from mammals. It rises only when a baby suckles. Hormone oxytocin cause tiny muscles around the alveoli to squeeze the milk by using small tubes called milk ducts. Oxytocin is also responsible for contraction of uterus muscles, during and after birth. Prolactiiin and Oxytocin help the mother to form an emotional bond with her baby. Progesterone regulates the growth in size of alveoli and lobes. Estrogen stimulates the milk duct system to grow. Follicle stimulating hormone, luteinizing hormone and human chorionic gonadotropin control the level of estrogen and progesterone production.    

Select the correct statement.

zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. hPL plays a major role in parturition.

  2. Fetus shows movements first time in the ${7}^{th}$ month of pregnancy.

  3. Signal for parturition comes from fully developed fetus and placenta.

  4. Embryo's heart is formed by the ${2}^{nd}$ month of pregnancy.

Show answer
Correct Option: C
Explanation:

Parturition, also called birth or childbirth, process of bringing forth a child from the uterus, or womb. The prior development of the child in the uterus is described in the article human embryology. The process and series of changes that take place in a woman’s organs and tissues as a result of the developing fetus are discussed in the article pregnancy. Parturition is induced by a complex neuroendocrine mechanism. The signals for parturition originate from the fully-developed foetus and the placenta which requires the release of oxytocin from the posterior lobe of the maternal pituitary.

So the correct option is 'signal for parturition comes from fully developed foetus and placenta'.

Corpus luteum develops from

zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. Oocyte

  2. Nephrostome

  3. Graafian follicle

  4. None of the above

Show answer
Correct Option: C
Explanation:

After ovulation the lining of the (graafian) follicles grow inward, forming corpus luteum (yellow body), which temporary function as endocrine tissue. It secrete estrogen and progesterone, which stops additional ovulation, and thickening of uterine wall. If pregnancy does not occur within 14 days corpus luteum degenerates and menstruation follows.

Gestation period is the duration

zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. Of fertilization

  2. Between egg growth and ovulation

  3. Between fertilization and parturition

  4. None of the above

Show answer
Correct Option: C
Explanation:
The gestation period is the duration between fertilization and parturition. Gestation period is the time in which a foetus develops, beginning with fertilization and ending at birth.
Fertilization is the process of fusion of two types of gametes (spermatozoon and ovum), so as to form a diploid zygote.
Parturition is the act of expelling the full term young ones from the mother's uterus at the end of gestation.

Gestation period in human beings is about 

zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. 10 weeks

  2. 28 weeks

  3. 32 weeks

  4. 36 weeks

Show answer
Correct Option: D
Explanation:

Gestation (pregnancy) is completed in about 266 days from the mother's last menstruation. The gestation period of human beings is 270 days to 280 (approximately). It is usually about 266 days i.e., 36 weeks.

The process of delivery of the feotus is called 

zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. Parturition

  2. Implantation

  3. Fertilisation

  4. Lactation

  5. Ovulation

Show answer
Correct Option: A
Explanation:

Parturition can be defined as the act of expelling the full term young ones from the mother's uterus at the end of the gestation period. In other words, the process of delivery of the fetus is known as parturition.