Tag: mouth and buccal cavity

Questions Related to mouth and buccal cavity

Emulsification of fats is done by .... 

bio-chemistry digestive system of human digestive system- glands mouth and buccal cavity digestive glands

  1. saliva

  2. gastric juice

  3. bile

  4. intestinal juice

Show answer
Correct Option: A

With reference to a normal human being, which one of the following statements is not correct?

bio-chemistry digestive system of human digestive system- glands mouth and buccal cavity digestive glands

  1. Human saliva is slightly acidic

  2. An adult human may secrete $1$ to $1.5$ litres of saliva per day

  3. Saliva is secreted by six pairs of salivary glands in human beings

  4. The salivary enzymes(ptyalin) breaks down cooked starch into maltose

Show answer
Correct Option: A

What is optimum pH for the action of salivary anylase?

bio-chemistry digestive system of human digestive system- glands mouth and buccal cavity digestive glands

  1. $1.8$

  2. $6.8$

  3. $7.4$

  4. $8$

Show answer
Correct Option: B
Explanation:

The optimum pH for the enzymatic activity of salivary amylase ranges from 6 to 7. Above and below this range, the reaction rate reduces as enzymes get denaturated. The enzyme salivary amylase is most active at pH 6.8. 

So, the correct option is '6.8'.

Salivary glands secrete

bio-chemistry digestive system of human digestive system- glands mouth and buccal cavity digestive glands

  1. Amylase

  2. Pepsin

  3. Trypsin

  4. Bile juice

Show answer
Correct Option: A
Explanation:

An amylase is an enzyme that catalyses the hydrolysis of starch into sugars. Amylase is present in the saliva of humans and some other mammals, where it begins the chemical process of digestion. Bile juice is secreted by liver. Pepsin and trypsin are produced in small intestine. 

Therefore, the correct answer is option A.

Deoxygenated blood is processed by

biology digestion and absorption digestive system- glands mouth and buccal cavity digestive glands

  1. Hepatocytes

  2. Neurocytes

  3. Lymphocytes

  4. None of the above

Show answer
Correct Option: A
Explanation:

  • The liver receives blood supply from two sources. 
  • The first is the hepatic artery which delivers oxygenated blood from the general circulation. 
  • The second is the hepatic portal vein delivering deoxygenated blood from the small intestine containing nutrients. Hence, Deoxygenated blood is processed by hepatocytes.
So, the correct answer is 'hepatocytes'.

Arterioles provide ___ to liver.

biology digestion and absorption digestive system- glands mouth and buccal cavity digestive glands

  1. Oxygen

  2. Protein

  3. Energy

  4. None of the above

Show answer
Correct Option: A
Explanation:

  • An arteriole is a small-diameter blood vessel in the microcirculation that extends and branches out from an artery and leads to capillaries.
  • The liver receives blood from two major blood vessels. The hepatic arterioles bring oxygen-rich blood from the heart.
  • The hepatic portal vein brings blood rich in digested nutrients from the intestine. This means excess nutrients can be removed and stored before blood circulates around the body. Hence Arterioles provides oxygen to the liver.
So, the correct answer is 'oxygen'.

Cystic artery supplies blood to

biology digestion and absorption digestive system- glands mouth and buccal cavity digestive glands

  1. Kidney

  2. Heart

  3. Gall bladder

  4. None of the above

Show answer
Correct Option: C
Explanation:
The common hepatic artery further bifurcates into the left and right hepatic arteries to deliver blood the left and right sides of the liver. As the right hepatic artery approaches the gallbladder, it branches off to form the cystic artery, which supplies the gallbladder and cystic duct with oxygenated blood. Hence, the cystic artery supplies blood to the gall bladder.

So, the correct answer is 'gall bladder'.

A digestive enzyme, salivary amylase, in the saliva being digestion of 

bio-chemistry digestive system of human digestive system- glands mouth and buccal cavity digestive glands

  1. Protein

  2. Nucleic acids

  3. Fats

  4. Carbohydrates

Show answer
Correct Option: D
Explanation:
  • First, salivary glands in your mouth make salivary amylase, which begins the digestive process by breaking down starch when you chew your food, converting it into maltose, a smaller carbohydrate. 
  • The breakdown of starch is just one of the many steps in the process of digestion. Although digestion begins in the mouth, it continues in the stomach and intestines.
  • Amylase is an enzyme that breaks down starch to sugar. The amylase in the mouth, salivary amylase, is called ptyalin. 
  • Ptyalin can do digestive can work in the stomach for several hours. Iodine and Benedict's solution is used to recognize starch and sugar (maltose) in our saliva.
Therefore, the correct answer is option D.

Amount of saliva secreted daily in humans is

bio-chemistry digestive system of human digestive system- glands mouth and buccal cavity digestive glands

  1. 250 ml

  2. 500 ml

  3. 100 ml

  4. 1000 ml

Show answer
Correct Option: D
Explanation:

There are three major parts of salivary glands that secrete saliva with the digestive enzyme such as parotid, submandibular and sublingual glands. Normally secretion of saliva is constant, regardless of the presence of food in the mouth. The amount of saliva secreted in 24 hours usually amounts from 1 liter to 1.5 litres. 

Therefore, the correct answer is option D.

Saliva is produced by

bio-chemistry digestive system of human digestive system- glands mouth and buccal cavity digestive glands

  1. Pancreas

  2. Gall bladder

  3. Gastric glands

  4. Submaxillary and sublingual glands

Show answer
Correct Option: D