Tag: zoology

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Questions Related to zoology

Multiple choice zoology the endocrine system adrenal gland thymus and adrenal gland adrenal glands

In urinary, system, aldosterone takes part in retention (reabsorption) of

  1. $Ca^{2+}$
  2. $ K^+$
  3. $Na^+$

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

In urinary, system, aldosterone takes part in retention of sodium ions. The ADH released by posterior pituitary triggers the release of aldosterone which increases the concentration of sodium ions in the blood. The increased salt concentration in the blood increases the blood osmotic potential which further increases reabsorption of water and incraeses the blood volume and blood pressure.

So, the correct answer is 'Na$^+$'.

Multiple choice zoology the endocrine system adrenal gland thymus and adrenal gland adrenal glands

Find out the correct layers in T.S. of adrenal gland.

  1. Medulla, Zona fasciculata, Zona reticularis, Zona glomerulosa

  2. Zona glomerulosa, Medulla, Zona reticularis, Zona fasciculata

  3. Zona glomerulosa, Zona fasciculata, Zona reticularis, Medulla

  4. Zona reticularis, Zona fasciculata, Zona glomerulosa, Medulla
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Adrenal glands are paired glands located at the anterior part of the kidneys. It is composed of two types of tissues, adrenal cortex and adrenal medulla. The adrenal medulla is located at the centre and the adrenal cortex lies outside the adrenal medulla. Adrenal cortex is divided into three layers - zona reticularis (innermost layer of the adrenal cortex), zona fasciculata (middle layer of the adrenal cortex) and zona glomerulosa (outermost layer of the adrenal cortex). The correct layers in T.S of adrenal gland is zona glomerulosa, zona fasciculata, zona reticularis and medulla.
So, the correct answer is 'zona glomerulosa, zona fasciculata, zona reticularis and medulla'.
Multiple choice zoology the endocrine system adrenal gland thymus and adrenal gland adrenal glands

Injury to adrenal cortex is not likely to affect secretion of

  1. Andlostenedione and dehydroepian-drosterone

  2. Adrenaline

  3. Cortisol

  4. Aldosterone
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Adrenaline is secreted from adrenal medulla in response to stress conditions in the body. Androstenedione and dehydroepiandrosterone (form of androgens), cortisol and aldosterone are corticoid hormones secreted by adrenal cortex. They are steroid hormones that regulate water balance and electrolyte balance in the body. Adrenal cortex secretes glucocorticoids (cortisol), mineralocorticoids (aldosterone) and sexocorticoids (androgens).   
So, the correct answer is 'Adrenaline'.
Multiple choice zoology the endocrine system adrenal gland thymus and adrenal gland adrenal glands

Adrenal gland is derived from

  1. Endoderm

  2. Ectoderm

  3. Mesoderm

  4. Ectoderm and mesoderm
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
During embryonic stages, three germ layers are formed which give rise to various organs of foetus. The three germ layers are:
  • Outer layer ectoderm
  • Middle layer mesoderm
  • Inner layer endoderm
Adrenal gland has two parts, adrenal cortex and adrenal medulla.
Adrenal cortex is derived from mesoderm and adrenal medulla is derived from ectoderm.
So, the correct answer is 'Ectoderm and mesoderm'.
Multiple choice zoology the endocrine system adrenal gland thymus and adrenal gland adrenal glands

Hormone controlling Na$^+$ - K$^+$ ion concentration is 

  1. Aldosterone

  2. Antidiuretic hormone

  3. Progesterone

  4. Pitocin
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A. Aldosterone is a mineralocorticoid hormone secreted from the adrenal cortex. It maintains the electrolyte balance in the body by reducing the loss of sodium through urine and sweat. Hence, it controls Na⁺ - K⁺ ion concentration.
B. Anti diuretic hormone (ADH), is secreted from the posterior part of pituitary gland. This hormone increases reabsorption of water in kidneys and this results in decreased rate of urine production.
C. Progesterone is a steroid female sex hormone which is also known as pregnancy hormone. It maintains the inner lining of uterus which aids in implantation of embryo in the uterus. 
D. Pitocin is synthetic form of oxytocin. Oxytocin is secreted from the posterior pituitary and helps in the contraction of uterus during childbirth and also stimulates release of milk from mammary glands i.e. lactation.
So, the correct answer is 'Aldosterone'.
Multiple choice zoology the endocrine system adrenal gland thymus and adrenal gland adrenal glands

The fight-or-flight response is developed by the hormones of

  1. hypothalamus

  2. middle pituitary

  3. adrenal medulla

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

The adrenal medulla secretes two hormones called adrenaline or epinephrine and noradrenaline or norepinephrine. These are commonly called as catecholamines. Adrenaline and noradrenaline are rapidly secreted in response to the stress of any kind and during emergency situations and are called emergency hormones or hormones of Fight or Flight.

So the correct option is adrenal medulla.

Multiple choice zoology the endocrine system adrenal gland thymus and adrenal gland adrenal glands

Choose the correct answer from the alternatives given.
The adrenal glands lie in contact with the back of the:

  1. kidneys

  2. pancreas

  3. thyroid

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

Our body had one pair of adrenal glands, one at the anterior part of each kidney. The gland is composed of two types of tissues. The centrally located tissue is called the adrenal medulla and outside this lies the adrenal cortex.

So the correct answer is kidneys.