Tag: zoology

Questions Related to zoology

Expiration is the process of

zoology respiratory system of human mechanism of respiration respiratory cycle breathing and exchange of gas

  1. Taking air in

  2. Inhalation

  3. Releasing CO$ _2$

  4. Giving air out

Show answer
Correct Option: D
Explanation:

During expiration, the diaphragm relaxes, and the volume of the thoracic cavity decreases, while the pressure within it increases. As a result, the lungs contract and air is forced out. 

Therefore, the correct answer is option D.

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

Which of the following hormones are released by mechanical stimulation of stomach?

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. Gastrin

  2. Progesterone

  3. Secretin

  4. Pancreozymin

Show answer
Correct Option: A
Explanation:

Answer is option A i.e. "Gastrin"
Stimuli in the stomach and small intestine activate or induce gastric juice production. The gastrin in digestive acid secretion is induced by the mechanical and chemical stimulation of stomach.

Which hormone stimulates the stomach to secrete gastric juice?

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. Gastrin

  2. Parathormone

  3. Thyroxin

  4. Insulin

Show answer
Correct Option: A
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 gastric cells in the pyloric antrum of the stomach, duodenum, and the pancreas. Gastrin is directly responsible for the release of gastric acid, which breaks down the proteins in the food you eat.

So, the correct answer is 'Gastrin'.

VIP hormone is produced in

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. Pancreas

  2. Intestine

  3. Gall bladder

  4. Both A and B

Show answer
Correct Option: D
Explanation:

  •  Vasoactive intestinal peptide, also known as vasoactive intestinal polypeptide or VIP, is a peptide hormone that is vasoactive in the intestine. VIP is produced in many tissues of vertebrates including the gut, pancreas, intestine and suprachiasmatic nuclei of the hypothalamus in the brain. Hence, VIP hormone is produced in Pancreas and Intestine. 
So, the correct answer is 'Both A and B'.

Which of the following is associated with secretion and stimulation of secretin hormone?

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. Duodenum and pancreas

  2. Duodenum and liver

  3. Stomach and gastric glands

  4. Thyroid and parathyroid

Show answer
Correct Option: A
Explanation:

Answer is option A i.e. "Duodenum and pancreas"
Secretin is a hormone that regulates water homeostasis throughout the body. Duodenum and pancreas are associated with secretion and stimulation of secretin hormone in following way: when hydrochloric acid passes from the stomach into the duodenum, secretin is released into the bloodstream and stimulates the duct cells of the pancreas to secrete water and bicarbonate.