Tag: coordination

Questions Related to coordination

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?

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

  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

Show answer
Correct Option: A

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

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

  1. FSH

  2. LH

  3. FSH, LH, estrogen

  4. Progesterone

Show answer
Correct Option: C

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

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

  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

Show answer
Correct Option: C
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.

During preovulatory phase?

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

  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

Show answer
Correct Option: C

A decrease in level of oestrogen and progesterone causes 

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

  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

Show answer
Correct Option: D
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'.

    Progesterone level falls during

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

    1. Gestation

    2. Menopause

    3. Lactation

    4. Mensturation

    Show answer
    Correct Option: B
    Explanation:

    Progesterone levels are higher when the women are pregnant and even the levels are normal during nonpregnancy time. The progesterone levels fall when women reach to menopause stage.

    So the correct option is 'Menopause.'

    During a menstrual cycle and secreted by the corpus luteum prepare the uterus for pregnancy.

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

    1. FSH; LH

    2. FSH; testosterone

    3. Estrogen; progesterone

    4. Estrogens only

    Show answer
    Correct Option: C
    Explanation:

    Progesterone and estrogen are necessary to prepare the uterus for menstruation, and their release is triggered by the hypothalamus. Estrogens are a group of sex hormones that promote the development and maintenance of female characteristics in the human body. During the menstrual cycle, estrogen produces an environment suitable for the fertilization, implantation, and nutrition of an early embryo. Progesterone prepares the body for pregnancy by causing the uterine lining to thicken. If a woman is not pregnant, the corpus luteum disappears.

    So the correct option is 'estrogen, progesterone'.

    During a menstrual cycle, a mid-cycle surge of triggers ovulation.

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

    1. Estrogen

    2. Progesterone

    3. LH

    4. FSH

    Show answer
    Correct Option: C
    Explanation:

    Hormone prepares the body for ovulation before menstrual phase can begin. The pituitary gland releases two hormones, FSH (Follicle Stimulating Hormone) and LH (Luteinizing Hormone). LH stimulates the follicle to manufacture and secrete estrogen. When the amount of estrogen produced in your body reaches a certain level, it causes the pituitary gland to release a surge of LH. The LH surge is what triggers the almost-ripened egg to become fully matured and break through the follicle and the process is known as ovulation.

    So the correct option is 'LH'.


    Proliferation of endometrium occurs under the influence of increasing amount of

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

    1. Estrogen

    2. Progesterone

    3. LH

    4. FSH

    Show answer
    Correct Option: A
    Explanation:

    Estrogens are a group of sex hormones that promote the development and maintenance of female characteristics in the human body. They play an essential role in the growth and development of female secondary sexual characteristics, such as breasts, pubic and armpit hair, and the regulation of the menstrual cycle and reproductive system. Estrogen enhances and maintains the mucous membrane that lines the uterus. It increases the size of the endometrium as well as enhancing blood flow, protein content, and enzyme activity. 

    So the correct option is 'estrogen'.

    Menstruation is triggered by an abrupt decline in the amount of

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

    1. Estrogen

    2. Progesterone

    3. Luteinizing hormone

    4. Follicle-stimulating hormone

    Show answer
    Correct Option: B
    Explanation:

    Progesterone belongs to a group of steroid hormones called progestogens. It is mainly secreted by the corpus luteum in the ovary during the second half of the menstrual cycle. It plays important roles in the menstrual cycle and in maintaining the early stages of pregnancy. Progesterone, a hormone secreted by the female reproductive system that functions mainly to regulate the condition of the inner lining (endometrium) of the uterus. When a woman has her menstrual period, her progesterone level is usually low during the first few days.

    So the correct option is 'progesterone'.