A&P2: Test 3 Digestive quiz

Amylase from saliva digests

Carbohydrates (starch)

Which of these processes occurs in the mouth? Ingestion Chemical digestion Mechanical digestion All of the above

all of the above

Nucleosidase is an enzyme that breaks the

bond between the sugar and the nitrogenous base of the nucleoside.

The order of the small intestine segments, from proximal to distal, is

duodenum, jejunum, ileum

Which peritoneal fold attaches the liver to the anterior internal body wall?

falciform ligament

The ________ supports most of the small intestine and provides stability and limited movement.

mesentery

Manufacturers of some medications used to treat heartburn advertise that their products shut down the acid-producing pumps in the stomach. Where are these "acid-producing pumps"? In other words, which type of gastric gland cell secretes acid?

parietal cells

Chief cells secrete

pepsinogen

Carboxypeptidase is an enzyme that helps digest

peptides within the small intestine.

Which organ is not considered an accessory digestive organ? Teeth Tongue Pharynx Pancreas Salivary glands

pharynx

Which of these processes occurs throughout most of the alimentary canal? Segmentation Propulsion Absorption Ingestion

propulsion

The gastroenterologist has just determined that you have a blockage in your jejunum and he will have to perform surgery, making a small incision in the wall to remove the obstruction. Which tunic will be cut first?

serosa

The layers of the alimentary canal, from outside to inside, are the __________.

serosa, muscular, submucosa, mucosa

What is the primary function of the large intestine?

water and electrolyte absorption

Which of the following enhance the absorptive effectiveness of the small intestine? Circular folds Intestinal movements Microvilli Villi All of the above

All of the answers are correct.

Bile catalyzes the breakdown of triglyceride into a monoglyceride and two free fatty acids.

False

Salivary amylase is activated once it enters the acidic environment of the stomach.

False

As fatty acids are absorbed, the resulting fat molecules are coated in protein for what reason?

Fats are not soluble in the water portion of plasma, but fats encased in protein are.

_________ are frontal blade-shaped teeth that function in cutting or clipping as you bite into food

Incisors

Which organ is not part of the gastrointestinal tract? Esophagus Large intestine Liver Stomach Oral cavity

Liver

Digestion of proteins is initiated in the stomach by the enzyme

Pepsin

Which layer(s) of the wall of the GI tract contain a nerve plexus?

Submucosa and muscularis

Chief cells store and release an inactive precursor of a proteolytic enzyme (rather than the active form) to avoid destroying proteins within themselves.

True

During swallowing, elevation of the uvula and soft palate prevents food or fluid from entering the nasopharynx.

True

Enzymes that digest proteins secreted from the pancreas are activated

Within the lumen of the small intestine

________ catalyzes the digestion of starch and glycogen to maltose.

amylase

The term "canines" describes the teeth that

are lateral to the incisors, used for puncturing and tearing

If a fatty meal has been ingested, the liver and gallbladder need to be alerted about the need for bile. The receptors that are responsible for sensing the fat in the ingested food are referred to as

chemoreceptors

________ is secreted by stomach and is important for the absorption of Vitamin B12 in the small intestine.

intrinsic factor

Which of the following is not a phase of deglutition? Laryngeal Esophageal Voluntary Pharyngeal None

laryngeal

Bile, which emulsifies fats, is produced by the ___________.

liver

Nucleic acids are digested within the

small intestine