Tag: hormones of placenta

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Multiple choice biology chemical coordination and integration hormones of placenta coordination in human beings- chemical control endocrine system in humans

Several hormones like hCG, hPL, estrogen and progesterone are produced by

  1. Pituitary

  2. Ovary

  3. Placenta

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

The placenta produces two steroid hormones, Estrogen and Progesterone along with a few proteinaceous hormones which include human chorionic gonadotrophin (hCG), human placental lactogen (hPL), placental growth hormone, relaxin and kisspeptin. These hormones function to support pregnancy during the gestation period.

So, the correct option is 'Placenta'.

Multiple choice biology chemical coordination and integration hormones of placenta coordination in human beings- chemical control endocrine system in humans

Human chorionic gonadotrophin is secreted by

  1. Chorion

  2. Amnion

  3. Placenta

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

Human chorionic gonadotrophin is a hormone secreted by the placenta during pregnancy. It is a pregnancy indicating hormone.

Corpus luteum secretes mainly progesterone and small quantity of estrogen.
While amnion and chorion are extraembryonic Membranes separating the fetus from the endometrium.
So, the correct option is 'Placenta'.

Multiple choice biology chemical coordination and integration hormones of placenta coordination in human beings- chemical control endocrine system in humans

Hormone which is not produced in women only during pregnancy is 

  1. hCG

  2. hPL

  3. hCS

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

hCG (Human Chorionic Gonadotrophins), hPL (Human Placental Lactogen), hCS (human Chorionic somatomammotropin) are the hormones secreted by placenta so they are released during pregnancy only as the placenta is formed in pregnancy only. Placenta release other hormones as Estrogen and progesterone but these hormones are released by ovaries even in non-pregnant females. Therefore, hCG, hPL, and hCS are exclusively released in pregnancy from placenta.

So, the correct answer is 'Estrogen'.

Multiple choice biology chemical coordination and integration hormones of placenta coordination in human beings- chemical control endocrine system in humans

Several hormones like hCG, hPL, Oestrogen, Progesterone are produced by

  1. Ovary

  2. Placenta

  3. Fallopian tube

  4. Pituitary
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Hormones secreted by the placenta are  Estrogen, Progesterone, hCS, hPL & hCG. The placenta is an endocrine gland that is only present during pregnancy. hCG or the human chorionic gonadotrophin is secreted in excess amount in early pregnancy. IT's presence in urine is used for the pregnancy test. hCS or human placental somato mammotropin is also called placental lactogen. It acts a mild growth hormone. 
So the correct option is 'placenta'.
Multiple choice biology chemical coordination and integration hormones of placenta coordination in human beings- chemical control endocrine system in humans

Choose the correct answers from the alternatives given.
The main role of placenta in embryonic development is to

  1. act as storage organ

  2. convey nerve impulses

  3. provide essential requirements for growth of embryo

  4. protect embryo from shocks
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The placenta facilitates the supply of oxygen and nutrients to the embryo and also the removal of carbon dioxide and excretory/waste materials produced by the embryo.

So the correct option is 'provide essential requirements for growth of embryo'.

Multiple choice biology chemical coordination and integration hormones of placenta coordination in human beings- chemical control endocrine system in humans

Fetal ejection reflex in human female is induced by

  1. Pressure exerted by amniotic fluid

  2. Release of oxytocin from pituitary

  3. Fully developed foetus and placenta

  4. Differentiation of mammary glands
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The signals for parturition originates from the fully developed foetus and placenta, which induce mild uterine contractions called as foetal ejection reflex. This triggers the release of oxytocin, which is birth hormone from the maternal pituitary gland. This oxytocin starts a series of powerful contractions in the uterus to help expel the baby and limits bleeding of the placenta near the entry of the vaginal canal.
Thus, the correct answer is option (C).

Multiple choice biology chemical coordination and integration hormones of placenta coordination in human beings- chemical control endocrine system in humans

Consider the following statements and choose the correct options.
I. Ovule is attached to the placenta by means of a stalk called filaments.
II. Ovule fuses with the stalk in the region called hilum.
III. The two protective envelopes of the ovule are called integuments.
IV. The small opening in the tip of ovule is called germ pore.

  1. I and IV

  2. I and III

  3. II and IV

  4. II and III
Reveal answer Fill a bubble to check yourself
A Correct answer