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

Leydig's cells secrete

  1. Oestrogen

  2. Progesterone

  3. Testosterone

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

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

The effect of prolactin will be marked in

  1. Bones

  2. Pancreas

  3. Mammary gland

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

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

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

  1. Testosterone

  2. Oestrogen

  3. FSH

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

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 hormone is secreted at the time of parturition?

  1. Progesterone

  2. Thyroxin

  3. Relaxin

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

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

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

  1. Prolactin

  2. Luteotropic hormone

  3. Follicle stimulating hormone

  4. Gonadotropins
Reveal answer Fill a bubble to check yourself
D Correct answer
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). 

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

Breast development during pregnancy is induced by

  1. Thyroxin

  2. Progesterone and estrogen

  3. Relaxin

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

Estrogen promotes the development of the ductal system, while progesterone promotes the development of the lobulo-alveolar system in the breasts during pregnancy.

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

Hormone prolactin was discovered by

  1. Riddle

  2. Hisaw

  3. Leonard

  4. Hisaw and Leonard
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. Progesteron

  2. Androsterone

  3. Cortin

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

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

The function of glucagon hormone is

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  1. Gonochorism

  2. Gynaecomastia

  3. Feminism

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