Biology Animal Nutrition 2

Where is the site of absorption of glucose and amino acids?

• lacteal

• blood capillaries

• pancreas

• stomach

Why do the villi have long, finger like projections?

• to reduce the thickness of barrier for faster absorption

• to maintain concentration gradient across the intestinal wall

• to increase the thickness of barrier for faster absorption

• to increase the surface area to volume ratio for faster absorption

State the structure present on epithelial cells of the villi, which helps to further increase the surface area to volume ratio

(a)  

Fatty acids and glycerol are absorbed by which process?

• active transport only

• active transport and diffusion

• diffusion only

• diffusion and osmosis

Which of the following is not an adaptation feature of the small intestine to suit its function for absorption?

• the small intestine is long and its inner wall is highly folded

• the folds have numerous villi

• walls of villi are only one cell thick

• the surface area is greatly reduced

State the name of substance involved in emulsification process?

(a)  

Which event is not true in peristaltic action down the oespohagus?

• in front of the bolus of food, circular muscle will contract, whereas longitudinal muscle will relax

• in front of the bolus of food, both circular and longitudinal muscle will contract

• behind the bolus of food, circular muscle will contract, whereas longitudinal muscle will relax

• behind the bolus of food, longitudinal muscle will contract, whereas circular muscle will relax

why does your stomach secrete hydrochloric acid?

• to deactivate proteases in the stomach

• to allow bacteria in food to survive

• to denature enzyme salivary amylase

• to provide optimal pH for the action of enzyme salivary amylase

What process will occur to undigested food if they do not get digested along the alimentary canal?

(a)  

a person has been diagnosed with a disease, in which the villi in his small intestine is much shorter than normal. Which process is affected and why?

• digestion process; because his small intestines cannot be involved in physical digestion

• digestion process; because he will have no enzymes secreted into his small intestine

• absorption process; because he has reduced surface area to volume ratio, thus slower rate of absorption than normal

• absorption process; because he has thicker membrane, thus slower rate of absorption than normal