Chapter 14 Digestive System

List the steps of fat absorption in the small intestine in the correct sequence.

1. Fatty acides diffuse through intestinal cells 2. Fats are reconstructed in intestinal cells 3. Fats are incased in chylomicrons 4. Fats are carried off by lymph in lacteals as chylomicrons

Which of these are functions of saliva?

Aids in swallowing Initiates chemical digestion of carbohydrates Moistens food particles Dissolves molecules so they can be tasted Helps cleanse the mouth and teeth

The motor functions of the alimentary canal are of two basic types, mixing movements also known as

Blank 1: segmentation Blank 2: peristalsis

Which of the following components of the digestive system are specific to the alimentary canal?

Includes the mouth, pharynx, esophagus, stomach, intestines, rectum, and anus Passes through the thoracic and abdominopelvic cavities

Which of these statements are true about the serosal layer of the alimentary canal?

It is the outermost layer of the wall of the alimentary canal. It is also known as the visceral peritoneum. Its main function is to secrete serous fluid to lubricate the outer surface of the alimentary canal.

Select all the factors that stimulate production and secretion of pancreatic juice.

Parasympathetic impulses Secretin Cholecystokinin

Which of these statements are true regarding the mechanism of gastric secretion?

Parasympathetic impulses stimulate gastric glands to secrete gastric juice. Parasympathetic impulses stimulate stomach cells to release gastrin, which stimulates stomach mucosal cells.

Select all the functions of the liver.

Secretion of bile Carbohydrate, lipid and protein metabolism Storage of glycogen, iron, vitamins A, D and B12 Removal of toxins from blood

_______ is a mixing movement that occurs by alternately contracting and relaxing the smooth muscle in nonadjacent segments of the digestive tract while ______ is a wavelike propelling movement that pushes the contents ahead.

Segmentation; peristalsis

Identify the characteristics of minerals.

They are mostly concentrated in the bones and teeth They include elements such as calcium, iron, phosphate, sodium and chloride They may play diverse roles (i.e. nerve impulse conduction, muscle fiber contraction, blood clotting)

Which pancreatic enzyme functions to degrade proteins into peptides? Multiple choice question.

Trypsin

What does bile consist of?

Water Cholesterol Bile salts Bile pigments Minerals

Intestinal glands secrete their products when ___.

chyme is present in the small intestine

The digestive function of the pharynx is to transport food from the mouth to the

esophagus

The only type of digestion that occurs in the mouth is mechanical in which food is broken down into smaller pieces during chewing.

false

The small accessory digestive organ located posterior to the pyloric portion of the stomach is the

pancreas

The pancreas is stimulated to release pancreatic juice by ___ released from the intestinal mucosa.

secretin cholecystokinin

The wall of the alimentary canal consists of four layers. Beginning with the innermost tissues, the layers are: mucosa, submucosa, muscular layer and

serous layer