Lecture 16: Digestive System

The presence of hydrochloric acid in the stomach serves to ______ a. inactivate pepsinogen b. activate amylase c. digest fats d. kill bacteria e. emulsify proteins

kill bacteria

Lipases are enzymes that break down ___ a. disaccharides b. lipids c. proteins d. cellulose

lipids

the ____secretes bile a. liver b. small intestine c. stomach d. gallbladder e. pancreas

liver

the primary function of the large intestine is to ____ a. complete the digestion of protein b. absorb nutrients c. complete the digestion of carbohydrates d. complete the digestion of fats e. absorb water

absorb water

human Saliva contains ____ enzymes a. aminopeptidase b. trypsin c. chymotrypsin d. pepsin e. amylase

amylase

The acidic nature of chyme is neutralized by _____. a. potassium hydroxide b. sodium hydroxide c. bicarbonates d. vinegar

bicarbonates

What is the primary fuel for the body? a. carbohydrates b. lipids c. protein d. glycogen

carbohydrates

when fat enters the duodenum, it stimulates release of _____ to stimulate the gallbladder to release bile into the duodenum a. cholecystokinin b. gastrin c. trypsin d. amylase e. secretin

cholecystokinin

The digestive structure that stores concentrated bile is the a. gallbladder b. liver c. pancreas d. stomach e. duodenum

gallbladder

heartburn is caused by the ______ a. gastroesophageal sphincter remaining a bit open b. the gastroesophageal and the pyloric sphincters remaining too tightly closed c. pyloric sphincter remaining too tightly closed d. gastroesophageal sphincter remaining too tightly closed e. pyloric sphincter remaining a bit open

gastroesophageal sphincter remaining a bit open

The ______________of a bird's digestive system contains sand and rocks to aid in mechanical digestion. Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a. intestine b. crop c. mouth d. esophagus e. gizzard

gizzard

Which of the following is pseudo-ruminant? a. cow b. pig c. crow d. horse

horse

the ______ in the human body regulates hunger and satiety a. pancreas b. stomach c. hypothalamus d. small intestine e. liver

hypothalamus

Which of the following statements about the small intestine is false? a. Absorptive cells that line the small intestine have microvilli, small projections that increase surface area and aid in the absorption of food. b. The inside of the small intestine has many folds, called villi. c. Microvilli are lined with blood vessels as well as lymphatic vessels. d. The inside of the small intestine is called the lumen.

Microvilli are lined with blood vessels as well as lymphatic vessels.

The digestion of proteins in humans begins in the ____ a. small intestines b. mouth c. pancreas d. stomach e. large intestine

Stomach

The digestive juices from the liver are delivered to the _____. a. stomach b. liver c. duodenum d. colon

duodenum

Where does the majority of protein digestion take place? a. stomach b. duodenum c. mouth d. jejunum

duodenum

The digestion of starches begins in the ____ a. esophagus b. large intestine c. mouth d. stomach e. small intestine

mouth

Which enzyme is paired with the substance it digests? a. lipase - protein b. pepsin - starch c. pancreatic amylase - starch d. salivary amylase - protein e. trypsin - fats

pancreatic amylase - starch

Which of the following statements about digestive processes is true? a. Amylase, maltase and lactase in the mouth digest carbohydrates. b. Trypsin and lipase in the stomach digest protein. c. Bile emulsifies lipids in the small intestine. d. No food is absorbed until the small intestine.

Bile emulsifies lipids in the small intestine

Which of the following statements is untrue? a. Roughage takes a long time to digest. b. Birds eat large quantities at one time so that they can fly long distances. c. Cows do not have upper teeth. d. In pseudo-ruminants, roughage is digested in the cecum.

Birds eat large quantities at one time so that they can fly long distances.

Which hormone controls the release of bile from the gallbladder? a. pepsin b. amylase c. CCK d. gastrin

CCK

Which of the following statements is not true? a. Essential nutrients can be synthesized by the body. b. Vitamins are required in small quantities for bodily function. c. Some amino acids can be synthesized by the body, while others need to be obtained from diet. d. Vitamins come in two categories: fat-soluble and water-soluble.

Essential nutrients can be synthesized by the body.

Which of the following statements about the digestive system is false? a. Chyme is a mixture of food and digestive juices that is produced in the stomach. b. Food enters the large intestine before the small intestine. c. In the small intestine, chyme mixes with bile, which emulsifies fats. d. The stomach is separated from the small intestine by the pyloric sphincter.

Food enters the large intestine before the small intestine.

Excess glucose is stored as a. fat b. glucagon c. glycogen d. it is not stored in the body

Glycogen

Which of the following is a water-soluble vitamin? a. vitamin A b. vitamin E c. vitamin K d. vitamin C

Vitamin C

Place the five steps of digestion in most animals with a digestive tube in the proper order. a. absorption →mechanical processing →enzymatic hydrolysis →secretion of enzymes →elimination b. mechanical processing →secretion of enzymes →enzymatic hydrolysis →absorption →elimination c. mechanical processing →absorption →secretion of enzymes →enzymatic hydrolysis →elimination d. mechanical processing →secretion of enzymes →absorption →enzymatic hydrolysis →elimination e. absorption →enzymatic hydrolysis →mechanical processing →secretion of enzymes →elimination

mechanical processing →secretion of enzymes →enzymatic hydrolysis →absorption →elimination

The ______ of the human digestive tract can be classified as endocrine glands since they produce hormones a. liver and small intestine b. pancreas and stomach c. liver and gallbladder d. liver and pancreas e. pancreas and small intestine

pancreas and stomach

The digestion of lipids in humans begins in the ____ a. gastroesophageal sphincter remaining a bit open b. the gastroesophageal and the pyloric sphincters remaining too tightly closed c. pyloric sphincter remaining too tightly closed d. gastroesophageal sphincter remaining too tightly closed e. pyloric sphincter remaining a bit open

small intestine

The majority of enzymatic digestion in the human body takes place in the _____ a. large intestine b. stomach c. small intestine d. liver e. mouth

small intestine

Which hormone stops acid secretion in the stomach? a. gastrin b. somatostatin c. gastric inhibitory peptide d. CCK

somatostatin

The ___ produces gastrin that activates secretion of HCl and pepsinogen within itself a. large intestine b. mouth c. stomach d. liver e. small intestine

stomach