Tag: mouth and buccal cavity
Questions Related to mouth and buccal cavity
Emulsification of fats is done by ....
-
saliva
-
gastric juice
-
bile
-
intestinal juice
With reference to a normal human being, which one of the following statements is not correct?
-
Human saliva is slightly acidic
-
An adult human may secrete $1$ to $1.5$ litres of saliva per day
-
Saliva is secreted by six pairs of salivary glands in human beings
-
The salivary enzymes(ptyalin) breaks down cooked starch into maltose
What is optimum pH for the action of salivary anylase?
-
$1.8$
-
$6.8$
-
$7.4$
-
$8$
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.
Salivary glands secrete
-
Amylase
-
Pepsin
-
Trypsin
-
Bile juice
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.
Deoxygenated blood is processed by
-
Hepatocytes
-
Neurocytes
-
Lymphocytes
-
None of the above
- 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.
Arterioles provide ___ to liver.
-
Oxygen
-
Protein
-
Energy
-
None of the above
- 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.
Cystic artery supplies blood to
-
Kidney
-
Heart
-
Gall bladder
-
None of the above
A digestive enzyme, salivary amylase, in the saliva being digestion of
-
Protein
-
Nucleic acids
-
Fats
-
Carbohydrates
- 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.
Amount of saliva secreted daily in humans is
-
250 ml
-
500 ml
-
100 ml
-
1000 ml
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.
Saliva is produced by
-
Pancreas
-
Gall bladder
-
Gastric glands
-
Submaxillary and sublingual glands