Table of Contents
Which layer of the GI tract is composed of areolar connective tissue and a simple squamous epithelium?
A superficial layer called the serosa. It is a serous membrane composed of areolar connective tissue and simple squamous epithelium (mesothelium). The serosa is also called the visceral peritoneum because it forms a portion of the peritoneum.
Which of the following is the principal bile pigment?
PURPOSE: Bilirubin is the principal bile pigment, and is a normal product of red cell degradation.
What membrane anchors the teeth in place?
A periodontal ligament lines the socket; fibers from the ligament infiltrate both the root and the socket to anchor the tooth in place.
Which Plexus is located between the longitudinal and circular smooth muscle layers of the muscularis?
The Digestive System
| Question | Answer |
|---|---|
| This specific plexus is located between the longitudinal and circular smooth muscle layers of the muscularis | myenteric plexus |
| Why would you expect emotions such as anger or fear slow digestion | because they stimulate the sympathetic nerves that supply the GI tract |
Which layer contains the lining epithelium?
Which layer contains the lining epithelium? The mucosa is the innermost layer of the GI tract. It consists of epithelium, lamina propria, and muscularis mucosa.
Which layer of GI tract is composed of areolar connective tissue?
submucosa
The submucosa lies outside the mucosa. It consists of areolar connective tissue containing blood vessels, lymphatic vessels, and nerve fibers.
Does bile contain bilirubin?
Bile contains: Mostly cholesterol. Bile acids (also called bile salts) Bilirubin (a breakdown product or red blood cells)
What is the material covering the tooth root?
Cementum: While the crown of a tooth is covered by enamel, the root of a tooth is covered in a material known as cementum. This substance helps bind the tooth root to the supporting gums and jawbone.
What is the dentin of a tooth?
Dentin. That part of the tooth that is beneath enamel and cementum. It contains microscopic tubules (small hollow tubes or canals). When dentin loses its protective covering (enamel), the tubules allow heat and cold or acidic or sticky foods to stimulate the nerves and cells inside the tooth, causing sensitivity.
Where is the myenteric plexus located?
The myenteric plexus lies in between the outer longitudinal and inner circular smooth muscle layers of the intestines. By stimulating these muscles, it controls motility along the gastrointestinal tract.
What is biliverdin and bilirubin?
Bilirubin is generated from the breakdown of heme present in hemoproteins (e.g., hemoglobin and myoglobin) that is released from the catabolism of red blood cells. The heme ring is broken open by heme oxygenase forming biliverdin, which is reduced to bilirubin by biliverdin reductase (BVR; Fig. 1; 104).
What is biliverdin pigment?
Biliverdin (latin for green bile) is a green tetrapyrrolic bile pigment, and is a product of heme catabolism. It is the pigment responsible for a greenish color sometimes seen in bruises.
What material covers the crown of the tooth?
Enamel. Hard calcified tissue covering the dentin in the crown of tooth. Because it contains no living cells, tooth enamel cannot repair damage from decay or from wear.