Tag: endocrine system and chemical co-ordination

Questions Related to endocrine system and chemical co-ordination

Somatostatin 

zoology endocrine system and chemical co-ordination hypothalamus nervous and endocrine system in humans coordination in human beings- chemical control

  1. Stimulates glucagon release and inhibits insulin release

  2. Stimulates release of insulin and glucagon

  3. Inhibits release of insulin and glucagon

  4. Inhibits glucagon release and stimulates insulin release

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Correct Option: C
Explanation:
Somatostatin is secreted from hypothalamus and inhibits the release of growth hormone from pituitary gland. It is also produced in pancreas. Pancreas have three types of cells:
  1. Alpha cells: secrete glucagon which increases blood glucose level
  2. Beta cells: secrete insulin which decreases blood glucose level
  3. Delta cells: secrete somatostatin which inhibit secretion of glucagon and insulin.
So, the correct answer is 'Inhibits release of insulin and glucagon'.

Somatostatin (GHIH) is secreted by

zoology endocrine system and chemical co-ordination hypothalamus nervous and endocrine system in humans coordination in human beings- chemical control

  1. Pituitary

  2. Thyroid

  3. Pineal

  4. Hypothalamus

Show answer
Correct Option: D
Explanation:
A. Pituitary gland is the master gland that regulates the activity of other endocrine glands and secretes many hormones like growth hormone, follicle stimulating hormone, thyroid stimulating hormone etc.
B. Thyroid gland is situated between the trachea and larynx in the neck and secretes thyroxine hormone which increases oxygen consumption by metabolically active tissues.
C. Pineal gland is a small, rounded and reddish brown gland present at the dorsal side of forebrain. This gland secretes melatonin and serotonin hormones.
D. Hypothalamus is present in the forebrain. This gland secretes hormones that regulate the synthesis and secretion of hormones of pituitary gland. 
Somatostatin, also known as GHIH (Growth hormone inhibiting hormone) is secreted from hypothalamus and inhibits the release of growth hormone from pituitary gland.
So, the correct answer is 'Hypothalamus'.

Which of the following statements is false

zoology endocrine system and chemical co-ordination hypothalamus nervous and endocrine system in humans coordination in human beings- chemical control

  1. Hind brain contains medulla, pons and cerebellum

  2. Thalamus is an important sensory relay structure

  3. Cerebral cortex in humans is folded into convolutions

  4. Hypothalamus has an important role in recognising and experiencing

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Correct Option: D

Somatostatin is produced by

zoology endocrine system and chemical co-ordination hypothalamus nervous and endocrine system in humans coordination in human beings- chemical control

  1. Adenohypophysis

  2. Neurohypophysis

  3. Pineal gland

  4. Basal part of diencephalon and Pancreas

Show answer
Correct Option: D
Explanation:
Somatostatin is known as growth hormone-releasing inhibiting hormone. It inhibits the release of growth hormone from pituitary gland. Growth hormone stimulates body growth. Somatostatin is secreted from hypothalamus which represents basal part of diencephalon in forebrain. It inhibits the secretion of other pancreatic hormones such as insulin and glucagon.
So, the correct answer is 'Basal part of diencephalon'.

What is the effect of GnRH produced by hypothalamus?

zoology endocrine system and chemical co-ordination hypothalamus nervous and endocrine system in humans coordination in human beings- chemical control

  1. Stimulates the synthesis and secretion of androgens

  2. Stimulates secretion of milk in mammary glands

  3. Stimulates fetal ejection reflex

  4. Stimulates synthesis of carbohydrates from non-carbohydrates in liver

Show answer
Correct Option: A
Explanation:

Gonadotropin releasing hormone(GnRH), stimulates the anterior lobe of pituitary gland(adenohypophysis) to secrete two gonadotropins, FSH and LH. In males LH stimulates the Leydig's cells of the testis to secrete androgens.

During danger, emotional or during struggle etc., secretion of which hormone increases ____________.

zoology endocrine system and chemical co-ordination hypothalamus nervous and endocrine system in humans coordination in human beings- chemical control

  1. Vasopressin

  2. Oxytocin

  3. Abscissic acid

  4. Ethylene

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Correct Option: A

Choose the correct answer from the alternatives given.
Gonadotropin releasing hormone is secreted by:

zoology endocrine system and chemical co-ordination hypothalamus nervous and endocrine system in humans coordination in human beings- chemical control

  1. pituitary

  2. hypothalamus

  3. cerebellum

  4. gonads

Show answer
Correct Option: B
Explanation:
GH- RH ( Gonadotropic releasing hormone ) secretes growth hormone (GH). GH or STH (Growth or Somatotropin Hormone) stimulates body growth, protein, fat, and carbohydrate metabolism. The hormone is secreted by adenohypophysis (anterior pituitary). Hypersecretion of this hormone during the period of skeletal growth causes gigantism characterized by excessive growth of bones, with the enlargement of internal organs as well. Hypersecretion in adulthood causes acromegaly. Here the bones become abnormally thick due to ossification of periosteum and thickening of soft tissues as well. 
So the correct answer is hypothalamus.

Match column I with column II and select the correct option from the codes given.

Column I Column II
A. Thyroid (i) Acts on the renal tubules
B. Adrenal (ii) Regulates blood calcium level
C. Pituitary (iii) Maintains diurnal rhythm of our body
D. Pineal (iv) Acts on the meloncytes
zoology endocrine system and chemical co-ordination hypothalamus nervous and endocrine system in humans coordination in human beings- chemical control

  1. A-(iv), B-(iii), C-(ii), D-(i)

  2. A-(iii), B-(iv), C-(i), D-(ii)

  3. A-(iv), B-(ii), C-(iii), D-(i)

  4. A-(ii), B-(i), C-(iv), D-(iii)

Show answer
Correct Option: D
Explanation:

The thyroid gland is composed of stromal cells which release TCT (Thyrocalcitonin ) which regulates the calcium level in the body, Adrenal gland releases aldosterone which acts on renal tubules, Pituitary gland releases MSH which act on melanocytes, Pineal gland acts as a biological clock of body and maintains the diurnal rhythm of our body. So the correct option is ' A-(ii), B-(i), C-(iv), D-(iii)'

Thermoregulatory centre or thermostat in the body of homeothermal animals and man is found in

zoology endocrine system and chemical co-ordination hypothalamus nervous and endocrine system in humans coordination in human beings- chemical control

  1. Skin

  2. Diencephalon

  3. Hypothalamus

  4. Pituitary

Show answer
Correct Option: C
Explanation:

The hypothalamus of the diencephalon present in the forebrain is called the thermostat of the body because it is responsible for maintaining the temperature of the body through the mechanism of the homeostasis. 

A. Skin acts as a ventilator for perspiration.
B. Diencephalon is a big region, in which hypothalamus is present.
C. Hypothalamus is the thermostat of the body.
D. The pituitary gland is associated with the hypothalamus to perform chemical coordination via hormones.
Hence, the correct answer is 'Hypothalamus'

Lac is secreted by

zoology endocrine system and chemical co-ordination hypothalamus nervous and endocrine system in humans coordination in human beings- chemical control

  1. Dermal glands

  2. Intestinal glands

  3. Salivary glands

  4. Mucosal glands

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Correct Option: A