The liver is a reddish brown colour
because it is saturated in blood
. Every two and a half minutes a gallon of blood passes through the liver’s complicated network of arteries, veins and capillaries.
What stimulates salivary glands secrete saliva quizlet?
What stimulates salivary glands to secrete saliva?
parasympathetic impulses
elicit the secretion of a large volume of watery saliva.
Which salivary glands produces a secretion that is mainly serous?
The parotid salivary glands
, the largest of the three, are located between the ear and ascending branch of the lower jaw. Each gland is enclosed in a tissue capsule and is composed of fat tissue and cells that secrete mainly serous fluids.
Which of the following produces the mucus found in the submucosa of the small intestine?
They contain several important cell types: Enterocytes are the tall columnar epithelial cells that make up most of the intestinal lining and perform most of the intestinal digestive and absorptive functions.
Goblet cells
store and secrete mucous.
Where would you expect to find stellate macrophages of the liver?
Kupffer cells, also known as stellate macrophages and Kupffer–Browicz cells, are specialized cells localized
in liver within the lumen of the liver sinusoids
and are adhesive to their endothelial cells which make up the blood vessel walls.
What is the major function of the mucosa?
Layers of GI Tissue
The mucosa is the innermost layer, and functions in
absorption and secretion
. It is composed of epithelium cells and a thin connective tissue. The mucosa contains specialized goblet cells that secrete sticky mucus throughout the GI tract.
What is the function of the sphincter located at the top of the stomach?
What’s its function? The pyloric sphincter serves as a kind of gateway between the stomach and the small intestine. It
allows the contents of the stomach to pass into the small intestine
. It also prevents partially digested food and digestive juices from reentering the stomach.
What controls the movement of chyme?
The structure that controls the movement of chyme from the stomach into the duodenum is
the pyloric sphincter
. The pyloric sphincter is a circular muscle that opens and closes as controlled by the peristaltic contractions of stomach muscles.
Where are the major salivary glands located?
The parotid glands are the largest salivary glands. They are located
just in front of the ears
. The saliva produced in these glands is secreted into the mouth from a duct near your upper second molar.
What stimulates salivary glands to secretion saliva?
Salivary flow can be stimulated chemically using sialogogues or
by direct stimulation of secretory nerves supplying the salivary glands
. The increased flow can facilitate collection of saliva. Pilocarpine is a parasympathomimetic drug that can be used to stimulate salivary flow (Cocchetto and Bjornsson, 1983).
What enzymes are made in the small intestine?
| Region of digestive system Enzyme Substrate | Stomach Protease – pepsin Proteins | Small intestine – Duodenum Protease – trypsin Proteins | Small intestine – Ileum Protease – peptidase Peptides |
|---|
What are the layers of the mucosa?
The mucosa consists of
epithelium, an underlying loose connective tissue layer called lamina propria, and a thin layer of smooth muscle called the muscularis mucosa
.
What are the 4 layers of the GI tract?
All segments of the GI tract are divided into four layers:
the mucosa (epithelium, lamina propria, and muscular mucosae), the submucosa, the muscularis propria (inner circular muscle layer, intermuscular space, and outer longitudinal muscle layer)
, and the serosa (Figure 1).
Which three structures are always found in the portal triad region of the liver?
The portal triad is a distinctive arrangement around the perimeter of hepatic lobules, consisting of three basic structures:
a bile duct, a hepatic artery branch, and a hepatic portal vein branch
.
What are the two types of cells in the gastric gland and what are their functions?
- Mucous cells: secrete an alkaline mucus that protects the epithelium against shear stress and acid.
- Parietal cells: secrete hydrochloric acid.
- Chief cells: secrete pepsin, a proteolytic enzyme.
What organ is primarily involved in water absorption and feces formation?
| Question Answer | Organ responsible for most food absorption small intestine | Organ primarily involved in water absorption and feces formation large intestine | Area between the teeth and lips/cheeks oral cavity | Blind sac hanging from the initial part of the colon appendix |
|---|
