Tag: parts of the brain

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Multiple choice zoology control and coordination in living organisms control of blood glucose endocrine system and hormone hormones in human reproduction testes and ovary parts of the brain kidney

If ovaries from a pregnant woman are removed in 4$^{th}$ month of pregnency, then

  1. Development of embryo becomes abnormal

  2. Abortion occurs after some time

  3. Embryo develops normally till birth

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Trophoblast refers to outer cells of a blastocyst that serve in placenta formation in the beginning of the second trimester. It secretes human chorionic gonadotropin that ensures persistence of the corpus luteum. The later serves to secrete ovarian hormone estrogen, progesterone, and relaxin that are required to maintain pregnancy. Hence, removal of ovaries after 4th month would not affect the pregnancy. The correct answer is C.

Multiple choice biology control and coordination in living organisms control of blood glucose endocrine system and hormone hormones in human reproduction testes and ovary parts of the brain kidney

Immediate cause of induction of ovulation in human female, is surge of

  1. Progesterone

  2. LH

  3. FSH

  4. Estradiol
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

FSH is primarily involved in stimulating the growth of ovarian follicles, while LH induces ovulation. At ovulation, the ovum or egg is released and the ruptured follicle is transformed into a corpus luteum, which secretes progesterone as its main product. 

Multiple choice zoology control and coordination in living organisms control of blood glucose endocrine system and hormone hormones in human reproduction testes and ovary parts of the brain kidney

Leydig cells are meant for 

  1. Formation of sperm

  2. Production of progesterone

  3. Production of testosterone

  4. Nutrition of sperm
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Leydig cells, also known as interstitial cells of Leydig, are found adjacent to the seminiferous tubules in the testicle. They produce testosterone in the presence of luteinizing hormone (LH). 

Multiple choice biology control and coordination in living organisms control of blood glucose endocrine system and hormone hormones in human reproduction testes and ovary parts of the brain kidney

Ovulation in mammals occurs mainly under the influence of 

  1. TSH and ACTH

  2. FSH and LH

  3. TSH and STH

  4. MTH and ACTH
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Gonadotropin-releasing hormone (GnRH) is secreted by the hypothalamus and stimulates the release of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) from the anterior pituitary gland. 

FSH initiates follicular growth and the secretion of estrogens by the growth follicles. 
LH stimulates the further development of ovarian follicles and their full secretion of estrogens, brings about ovulation, promotes the formation of the corpus luteum and stimulates the production of estrogens, progesterone, relaxin and inhibin by the corpus luteum.

Multiple choice zoology control and coordination in living organisms control of blood glucose endocrine system and hormone hormones in human reproduction testes and ovary parts of the brain kidney

Progesterone hormone is secreted from 

  1. Placenta

  2. Corpus luteum

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The corpus luteum in the ovaries is the major site of progesterone production in humans, progesterone is also produced in smaller quantities by the ovaries themselves, the adrenal glands and, during pregnancy, the placenta.

Multiple choice zoology control and coordination in living organisms control of blood glucose endocrine system and hormone hormones in human reproduction testes and ovary parts of the brain kidney

"Anti abortion" hormone is 

  1. Relaxin

  2. Oxytocin

  3. Progestrone

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

Progesterone belongs to a group of steroid hormones called as 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. The progesterone prepares the body for pregnancy in the event, that the released egg is fertilised. If the egg is not fertilised, the corpus luteum breaks down, the production of progesterone falls and a new menstrual cycle begins. Hence, progesterone is called as the 'anti abortion' hormone. 

Multiple choice biology control and coordination in living organisms control of blood glucose endocrine system and hormone hormones in human reproduction testes and ovary parts of the brain kidney

Stimulation of uterine contraction during child birth is brought by 

  1. Adrenaline

  2. Progesterone

  3. Oxytocin

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

When contraction of the uterus starts, oxytocin is released, which stimulates more contractions and more oxytocin is released. In this way, contractions increase in intensity and frequency. Oxytocin causes contractions during the second and third stages of labor.

Multiple choice biology control and coordination in living organisms control of blood glucose endocrine system and hormone hormones in human reproduction testes and ovary parts of the brain kidney

Which of the following help in communication with the other members of the same species?

  1. Hormones

  2. Automones

  3. Pheromones

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

Pheromones are chemicals released by an organism into its environment enabling it to communicate with other members of its own species. It changes the behaviour of another animal of the same species (animals include insects). 

Multiple choice biology control and coordination in living organisms control of blood glucose endocrine system and hormone hormones in human reproduction testes and ovary parts of the brain kidney

Which of the following is not a example of sex pheromone? 

  1. Bombykol

  2. Muskone

  3. Formic acid

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

Formic acid is the simplest carboxylic acid and occurs naturally, mostly in ant venom. 

Sex pheromones are pheromones released by an organism to attract an individual of the opposite sex, encourage them to mate with them, or perform some other function closely related with sexual reproduction. Volatile pheromones are characterized as sex pheromones and usually form a specific odour and are focused on alarm sensitivity. 
Bombykol, the sex pheromones of silkworm moths, civetone from the civet cat and muskone from the musk deer are examples of sex pheromones.

Multiple choice zoology control and coordination in living organisms control of blood glucose endocrine system and hormone hormones in human reproduction testes and ovary parts of the brain kidney

Which temporary endocrine gland forms in ovary after ovulation? 

  1. Corpus callosum

  2. Corpus albicans

  3. Corpus luteum

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

The corpus luteum is a temporary endocrine structure in female mammals, that is involved in the production of progesterone and moderate levels of estradiol and inhibin. The corpus luteum develops from an ovarian follicle during the luteal phase of the menstrual cycle or oestrous cycle, following the release of a secondary oocyte from the follicle during ovulation.