Tag: coordination in human beings- chemical control

Questions Related to coordination in human beings- chemical control

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

Show answer
Correct Option: A

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

Column I Column II
A. Hypothalamus (i) Relaxin
B. Anterior pituitary (ii) Progesterone
C. Testis (iii) FSH and LH
D. Ovary (iv) Androgen
(v) Gonadotropin releasing hormone
zoology endocrine system and chemical co-ordination hypothalamus nervous and endocrine system in humans coordination in human beings- chemical control

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

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

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

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

Show answer
Correct Option: A
Explanation:

A. Hypothalamus: It is located in the base of the diencephalon. It releases releasor hormone(stimulate anterior pituitary) and inhibiting hormone( inhibit anterior pituitary). So, hypothalamus stimulates gonadotrophin-releasing hormone.

B. Anterior pituitary: It stimulates FSH and LH whose function is to stimulate spermatogenesis in male and growth of ovarian follicle in the female.
C. Testis: It secretes androgen in males such as testosterone whose function develops male reproductive organs and accessory sexual characters.
D. Ovary: It stimulates estrogen and progesterone. Progesterone stops egg production, attaches foetus to the uterine wall.
So, the correct answer is 'A- v, B-iii, C-iv, D-ii'.

Name the hormone that stimulates the secretion of gastric juice.

zoology control and coordination in living organisms gastrointestinal tract and liver hormones of heart, kidney, liver and gastrointestinal tract coordination in human beings- chemical control

  1. Renin

  2. Enterokinase

  3. Enterogastrone

  4. Gastrin

Show answer
Correct Option: D
Explanation:

Gastrin is a peptide hormone that stimulates secretion of gastric acid (HCl) by the parietal cells of the stomach and aids in gastric motility. It is released by G cells in the pyloric antrum of the stomach, duodenum and pancreas.

Hormone involved in the discharge of pancreatic juice in mammals is

zoology control and coordination in living organisms gastrointestinal tract and liver hormones of heart, kidney, liver and gastrointestinal tract coordination in human beings- chemical control

  1. Secretin

  2. Gastrin

  3. Cholecystokinin

  4. Enterogastrone

Show answer
Correct Option: A
Explanation:

Secretin is produced in the S cells of the duodenum, which are located in the crypts of Lieberkuhn. Secretin helps regulate the pH of the duodenum by inhibiting the secretion of gastric acid from the parietal cells of the stomach and stimulating the production of bicarbonate from the pancreas. 

Secretin stimulates the activity of

zoology control and coordination in living organisms gastrointestinal tract and liver hormones of heart, kidney, liver and gastrointestinal tract coordination in human beings- chemical control

  1. Liver

  2. Parietal cells

  3. Pancreas

  4. All of the above

Show answer
Correct Option: D
Explanation:

Secretin helps in regulating the $pH$ of the duodenum by

(1) Its inhibit the secretion of gastric acid from the parietal cells of the stomach.
(2) Stimulating the production of bicarbonate from ductal cells of the pancreas.
Secretin also stimulates duct cells in the liver for the release of bicarbonate into the bile.

Hypokalemia is caused by the overproduction of

zoology endocrine system and chemical co-ordination gastrointestinal tract and liver hormones of heart, kidney, liver and gastrointestinal tract coordination in human beings- chemical control

  1. Secretin

  2. VIP

  3. Doucrinin

  4. GIP

Show answer
Correct Option: B
Explanation:

  • Watery diarrhoea, hypokalemia, achlorhydria, is caused by overproduction of vasoactive intestinal peptide (VIP) which stimulates fluid and electrolyte secretion in the intestinal epithelium via activation of the cyclic adenosine monophosphate pathway. Hence, Hypokalemia is caused by the overproduction of VIP.
So, the correct answer is 'VIP'.

Pancreatic secretion is stimulated by

zoology endocrine system and chemical co-ordination gastrointestinal tract and liver hormones of heart, kidney, liver and gastrointestinal tract coordination in human beings- chemical control

  1. Secretin

  2. Cholecystokin-Pancreozymin

  3. Duocrinin

  4. Enterogastrone

Show answer
Correct Option: B