Tag: parts of the brain

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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 hormones FSH and LH are together called as

  1. Emergency hormone

  2. Neurohormone

  3. Gonadotropic hormone

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

The hormones FSH and LH are together called as gonadotropin hormones. They are called the gonadotropins as they stimulate gonadal activity. The anterior pituitary (pars distalis) releases following gonadotrophic hormones:

  1. Follicle stimulating hormone (FSH): In males, FSH regulates spermatogenesis (formation of sperms) and in females, FSH stimulates growth and development of ovarian follicles and secretion of estrogen hormone.
  2. Luteinizing hormone (LH): In males, LH is also called ICSH (interstitial cell-stimulating hormone) which stimulates testes to synthesize and secrete androgens (testosterone). It activates Leydig cells of the testes to secrete testosterone. In females, LH stimulates the ovulation of the fully matured Graafian follicles and also maintains the corpus luteum, formed from the remnants of Graafian follicles after ovulation. The corpus luteum secretes progesterone and some estrogen under the action of LH.
So, the correct answer is 'Gonadotropic 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

Gonadotropic hormone is produced by

  1. Interstitial cells of testis

  2. Adrenal cortex

  3. Adenohypophysis

  4. Posterior part of thyroid
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The anterior pituitary (also called the adenohypophysis or pars anterior) contains five types of endocrine cell, and they are defined by the hormones they secrete: somatotropes (GH); prolactins (PRL); gonadotropes (LH and FSH); corticotropes (ACTH) and thyrotropes (TSH). Hormones secreted by the anterior pituitary are trophic hormones and tropic hormones. 

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 hormone is concerned with the concentration of urine?

  1. Oxytocin

  2. Vasopressin

  3. Prolactin

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

Vasopressin also known as ADH (Anti-Diuretic Hormone) is made up by hypothalamus and it is transported to posterior pituitary gland which secretes the hormone into the blood stream. Its functions:

1. It helps to control blood pressure by acting on the kidneys and the blood vessels. 
2. However, Its most important role is to conserve the fluid volume of our body by reducing the amount of water (making it more concentrated) which passed out in the urine. Hence option B is correct.

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

MSH is secreted in man by which part of pituitary?

  1. Anterior Pituitary

  2. Dorsal lobe of pituitary

  3. Posterior lobe of pituitary

  4. Intermediate lobe of pituitary
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In vertebrates, the pituitary gland is an endocrine gland which is about the size of a pea. The intermediate lobe synthesizes and secretes melanocyte-stimulating hormone (MSH). It stimulates the production and release of melanin by melanocytes in skin and hair. Thus, the correct answer is option D.

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

Androgens are secreted by 

  1. Pituitary

  2. Testes

  3. Ovaries

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

Androgens are a group of hormones, that primarily influence the growth and development of the male reproductive system. The predominant and most active androgen is testosterone, which is produced by the male testes. The other androgens, which support the functions of testosterone, are produced mainly by the adrenal cortex, the outer portion of the adrenal glands and only in relatively small quantities.

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 produced by placenta?

  1. GH

  2. Gastrin

  3. ACTH

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

The placenta connects the developing foetus to the wall of the mother’s uterus during pregnancy.

The placenta produces two steroid hormones - oestrogen and progesterone. Progesterone acts to maintain pregnancy by supporting the lining of the uterus which provides the environment for the foetus and the placenta to grow. It prevents the shedding of this lining which would result in pregnancy loss. It also suppresses the uterine wall’s ability to contract, which is important in preventing labour from occurring before the end of pregnancy. Hence option D is correct.

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

LH and FSH are collectively called as

  1. Oxytocin

  2. Somatotropin

  3. Luteotrophin

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

LH and FSH are collectively called as gonadotropin. They are called the gonadotropins as they stimulate gonadal activity. The anterior pituitary (pars distalis) releases following gonadotrophic hormones:

  1. Follicle stimulating hormone (FSH) : In males, FSH regulates spermatogenesis (formation of sperms) and in females, FSH stimulates growth and development of ovarian follicles and secretion of estrogen hormone.
  2. Luteinizing hormone (LH) : In males, LH is also called ICSH (interstitial cell stimulating hormone) which stimulates testes to synthesise and secrete androgens (testosterone). It activates Leydig cells of the testes to secrete testosterone. In females, LH stimulates the ovulation of the fully matured Graafian follicles and also maintains the corpus luteum, formed from the remnants of Graafian follicles after ovulation. The corpus luteum secretes progesterone and some estrogen under the action of 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

Spermatogenesis is influenced by 

  1. Progesterone

  2. FSH

  3. STH

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

Spermatogenesis depends on the action of the FSH and LH hormone of the hypophysis on the testicular cells. LH acts on the interstitial cells, stimulating the production of testosterone necessary for the normal development of spermatogenic cells. FSH acts on the sertoli cells, stimulating adenylate cyclase and consequently increasing the presence of cAMP; it also promotes the synthesis and secretion of androgen-binding protein. This protein combines with testosterone and transports it into the lumen of the seminiferous tubules. 

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

ACTH is secreted by 

  1. Thyroid gland

  2. Thymus gland

  3. Pituitary gland

  4. Islets of Langerhans
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Adrenocorticotropic hormone (ACTH), also known as corticotropin, is a polypeptide tropic hormone produced and secreted by the anterior pituitary gland. It is an important component of the hypothalamic-pituitary-adrenal axis and is often produced in response to biological stress. Its principal effects are increased production and release of corticosteroids.