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Multiple choice biology coordination hormonal control of menstrual cycle regulation of the menstrual cycle life processes in living organisms- part 2

Pick up the correct information about menstrual cycle control.
1. Estrogen and progesterone of ovary

2. FSH of pituitary
3. FSH and LH of pituitary
4. Oxytocin.

  1. 1, 2, 3 correct

  2. 1, 2 correct

  3. 2, 4 correct

  4. 1, 3 correct
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Menstrual cycle starts with the menstrual flow followed by the follicle phase. During the follicular phase levels of gonadotropins (FSH and LH) increase and also the levels of estrogen increase. This rapid secretion of LH and FSH leads to LH surge and hence ovulation. After the ovulation luteal phase is accompanied by the formation of Corpus luteum. The Corpus luteum is responsible for the secretions of progesterone. 
So,  the correct option is '1, 3 correct'.
Multiple choice biology coordination hormonal control of menstrual cycle regulation of the menstrual cycle life processes in living organisms- part 2

Disintegration of corpus luteum occurs due to inhibition of secretion of ............ hormone.

  1. LTH

  2. FSH

  3. Progesterone

  4. LH
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Corpus luteum is responsible for higher levels of progesterone whereas LH is responsible for its persistence. As soon as the level of LH decreases, degeneration of corpus luteum takes place. FSH does not play any significant role in the regression of corpus luteum whereas LTH does not have any role in the menstrual cycle.

So, the correct option is 'LH'.

Multiple choice biology coordination hormonal control of menstrual cycle regulation of the menstrual cycle life processes in living organisms- part 2

GnRH secreted from hypothalamus mainly stimulates the release of

  1. Thyroxin from thyroid gland

  2. ADH from posterior pituitary

  3. FSH and LH from anterior pituitary

  4. Aldosterone from adrenals
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

GnRH stimulates the synthesis and secretion of the two gonadotropins—luteinizing hormone (LH) and follicle-stimulating hormone (FSH)—by the anterior pituitary gland. In order to increase serum gonadotropin concentrations in patients with GnRH deficiency, the releasing hormone must be administered in pulses.
So the correct option is ' FSH and LH from anterior pituitary'.

Multiple choice biology coordination hormonal control of menstrual cycle regulation of the menstrual cycle life processes in living organisms- part 2

Which of the following is not a function of progesterone?

  1. Gestation

  2. Inhibition of ovulation

  3. Uterine growth and development

  4. Stimulation of mammary secretion.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation


Progesterone is the ovarian hormone which helps in the development of mammary glands but not the secretion of mammary glands.
So the correct option is 'Stimulation of mammary secretion.’

Multiple choice biology coordination hormonal control of menstrual cycle regulation of the menstrual cycle life processes in living organisms- part 2

Estrogen is secreted by-

  1. Primary follicle

  2. Graafian follicle

  3. Corpus luteum

  4. Both (2) & (3)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A primary follicle is surrounded by single or several layers of cuboidal, granulosa cells. It is an immature ovarian follicle. Based on the number of granulosa cell layers, the developing ovarian follicles can be categorised into three classes: primary follicles, secondary follicles, and early tertiary follicles.

So, the correct option is 'Primary follicle'.

Multiple choice biology coordination hormonal control of menstrual cycle regulation of the menstrual cycle life processes in living organisms- part 2

FSH was administered to a group of rats who had their anterior glands removed.Compared with the control group of normal rats,which of the following events did NOT takes places in the experiment animals?

  1. Proliferation of the endometrium

  2. Maturation of a Graafian follicle

  3. Development of the corpos luteum

  4. Build - up of oestrogen in the blood stream
Reveal answer Fill a bubble to check yourself
C Correct answer
Multiple choice biology coordination hormonal control of menstrual cycle regulation of the menstrual cycle life processes in living organisms- part 2

Mainly which type of hormones control the menstrual cycle in human beings?

  1. FSH

  2. LH

  3. FSH, LH, estrogen

  4. Progesterone
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The menstrual cycle is regulated by the hypothalamic-pituitary-ovarian axis. FSH, LH, and estrogen are the primary hormones that coordinate the follicular phase, ovulation, and the luteal phase.

Multiple choice biology coordination hormonal control of menstrual cycle regulation of the menstrual cycle life processes in living organisms- part 2

Which of the following events occur if fertilisation do not takes place. 

  1. Secretion of progesterone hormone increase

  2. Secretion of estrogen hormone stops

  3. Uterus inner wall layer and unfertilised egg will shed off

  4. Uterus inner wall increased and unfertilised egg will shed off
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

If the egg is fertilised by a sperm as it travels down the Fallopian tube, then pregnancy occurs. 

But if the egg does not because fertilised, then the lining of the uterus (endometrium) is shed during ht mensuration.
Hence, the uterus inner wall and unfertilised egg will shed off if no fertilisation occurs.

Multiple choice biology coordination hormonal control of menstrual cycle regulation of the menstrual cycle life processes in living organisms- part 2

During preovulatory phase?

  1. Concentration of estrogen remain low than progesteron

  2. LH is produced by follicular cells

  3. FSH stimulates the ovarian follicle to secrete estrogen

  4. FSH is positively regulated by estrogen
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

During the preovulatory (follicular) phase, FSH stimulates the growth of ovarian follicles. These follicles, in turn, secrete estrogen, which prepares the uterine lining.

Multiple choice biology coordination hormonal control of menstrual cycle regulation of the menstrual cycle life processes in living organisms- part 2

A decrease in level of oestrogen and progesterone causes 

  1. Loss of endometrium

  2. Growth of dilation of endometrium

  3. Release of ova from ovaries

  4. Constriction of uterine blood vessels leading to sloughing of uterine epithelium
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

    • Corpus luteum secretes large quantity of progesterone and small quantity of estrogen.
    • In the absence of fertilization, the corpus luteum degenerates resulting in decreased level of progesterone and estrogen.
    • This causes disintegration of the endometrium leading to menstruation, marking a new cycle.
    So, the correct option is 'Constriction of uterine blood vessels leading to sloughing of uterine epithelium'.