Tag: parts of the brain

Questions Related to parts of the brain

Leydig's cells secrete

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

  1. Oestrogen

  2. Progesterone

  3. Testosterone

  4. Aldosterone

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Correct Option: C
Explanation:

The male sex hormone testosterone is produced by Leydig cells. These cells are located in the connective (interstitial) tissue, that holds the tubules together within each lobule. The tissue becomes markedly active at puberty under the influence of the interstitial-cell-stimulating hormone of the anterior lobe of the pituitary gland.

The effect of prolactin will be marked in

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

  1. Bones

  2. Pancreas

  3. Mammary gland

  4. Liver

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Correct Option: C
Explanation:

Prolactin is produced both in the anterior pituitary gland. It stimulates the mammary glands to produce milk (lactation); increased serum concentrations of prolactin during pregnancy cause enlargement of the mammary glands of the breasts and prepare for the production of milk. 

The hormone which brings about characteristic changes in the male at puberty is called as

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

  1. Testosterone

  2. Oestrogen

  3. FSH

  4. LH

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Correct Option: A
Explanation:

In men, testosterone plays a key role in the development of male reproductive tissues, such as the testis and prostate as well as promoting secondary sexual characteristics, such as increased muscle, bone mass, and the growth of body hair.

Which hormone is secreted at the time of parturition?

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

  1. Progesterone

  2. Thyroxin

  3. Relaxin

  4. Glucocorticoid

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Correct Option: C
Explanation:

In women, relaxin is secreted into the circulation by the corpus luteum in the ovary. During pregnancy it is also released from the placenta, the membranes, which surround the foetus, and the lining of the uterus. During pregnancy, relaxin levels are at their highest in the first trimester. At this time it is believed to promote implantation of the developing foetus into the wall of the uterus and the growth of the placenta. Towards the end of pregnancy, relaxin promotes rupture of the membranes surrounding the foetus and the growth, opening and softening of the cervix and vagina to aid the process of childbirth. Relaxin can relax the ligaments at the front of the cervix to ease delivery of the baby. 

Adenohypophyseal hormone, that stimulates the gonads in males and females are called as

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

  1. Prolactin

  2. Luteotropic hormone

  3. Follicle stimulating hormone

  4. Gonadotropins

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Correct Option: D
Explanation:

Gonadotropins are secreted from the anterior pituitary gland and act on the gonads (i.e., the ovaries or testes). Gonadotrophs secrete two primary gonadotropins: luteinizing hormone (LH) and follicle-stimulating hormone (FSH). 

Breast development during pregnancy is induced by

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

  1. Thyroxin

  2. Progesterone and estrogen

  3. Relaxin

  4. None of the above

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Correct Option: B

Hormone prolactin was discovered by

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

  1. Riddle

  2. Hisaw

  3. Leonard

  4. Hisaw and Leonard

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Correct Option: A
Explanation:

Prolactin was discovered in non-human animals around 1930 by Oscar Riddle. It promotes milk production in the female. It is also known as a lactogenic hormone. It is produced by the pituitary gland.

So, the correct answer is option A.

In male, the retard growth of the secondary sexual characters is due to the deficiency of which one of the following hormones?

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

  1. Progesteron

  2. Androsterone

  3. Cortin

  4. Thyroxin

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Correct Option: B
Explanation:

Androgens include the male hormones testosterone and androsterone and promote development of male sex characteristics. The androgens promote the secondary sex characteristics of muscle growth, lowered voice range, the Adam's apple, and increased body hair.

The function of glucagon hormone is

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

  1. To increase glycogenesis

  2. To decrease blood sugar level

  3. To release glucose from liver cells and glycogenolysis promotion

  4. To increase the absorption of glucose and fatty acids through cell

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Correct Option: C
Explanation:

Glucagon's role in the body is to prevent blood glucose levels dropping too low. It acts on the liver and stimulates the conversion of stored glycogen (stored in the liver) to glucose, which can be released into the bloodstream. This process is called as glycogenolysis.

When mammary glands of male develop similar to that of female, then this condition is known as:

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

  1. Gonochorism

  2. Gynaecomastia

  3. Feminism

  4. None of the above

Show answer
Correct Option: B
Explanation:

Gynaecomastia is enlargement of the male breast tissue. Oestrogen stimulates breast tissue growth, while androgens inhibit it. The important factor is the ratio of active androgens to oestrogens. The ratio can be altered as a result of reduced testosterone production/action or enhanced oestrogen production/action or both.