lab 7

what are the 5 main functions of the digestive system?

1. ingestion

2. mechanical digestion

3. chemical digestion

4. absorption

5. excretion

explain absorption as a part of the digestive system functions

nutrients, water and electrolytes are being transported from the lumen of GI tract into the blood and lymphatic circulation

what does amylase do?

breaks down complex carbohydrates

what does lipase do?

breaks down triglycerides into monoglycerides and fatty acids

what is the enzyme that breaks down proteins into amino acids?

pepsin, trypsin, chymotrypsin, carboxypeptidase

where can we find carbohydrates in our diets?

plant-based foods like grains, fruits and vegetables, dairy products like milk and yogurt

where is amylase found in?

the saliva of our mouths and in the pancreatic juice

explain how carbohydrate digestion works

• begins with the presence of food in the oral cavity which stimulates taste buds

• PSNS causes salivary glands to secrete saliva with salivary amylase

  • sight, smell, and even though of food can trigger this

• salivary amylase does chemical digestion of starch @ mouth but stops at stomach because of acidity that destroys enzymes

• when chyme enters the duodenum, pancreatic amylase continues digestion making disaccharides and oligosaccharides

before most disaccharides and oligosaccharides get absorbed, they have to be broken down further by what?

brush border enzymes like sucrase, lactase, amylase, and maltase

where are brush border enzymes found?

on the apical cell membranes of enterocytes

monosaccharides