ANAT 100 Lecture Notes - Lecture 10: Left Colic Artery, Brush Border, Antrum

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sangriamammoth173

19 Apr 2018

School

Queen's University

Department

Anatomy and Cell Biology

Course

ANAT 100

Professor

Leslie W Mac Kenzie

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Document Summary

Anat 100: digestive tract (alimentary canal): mouth, oral cavity, pharynx, esophagus, stomach, small intestine, large intestine, anus, accessory digestive organs: tongue, teeth, salivary gland, liver, biliary ducts and gall bladder, pancreas. Functions of digestive system: mucosa: innermost layer, composed of three main elements, surface epithelium: reflects expected function of organ. Secretion, absorption, protection: lamina propria: layer of loose connective tissue under surface epithelium, muscularis mucosa: smooth muscle fibres under lamina propria, submucosa: layer below mucosa. Contains blood vessels, lymphatics, glans, nerve plexuses: muscularis externa: composed of circular and longitudinal layers of smooth muscle with nerve plexuses between layers. Plexuses responsible for muscular contraction to propel food through digestive tract: serosa or adventitia: outermost layer. Serosa when serous membrane, which secretes lubricating fluid. Section 2: oral cavity: vestibule: space between cheek, lips or gums, oral cavity proper: lies central to alveolar processes of mandible and maxillae. Oral cavity: gingivae: gums, palate: superior border of oral cavity.

Related Questions

1. Which organ is responsible for balancing the amount ofglucose floating around in the blood? (it stores excess glucosewhen there is too much and releases glucose into the bloodstreamwhen there isn't enough)

Select one:

a. liver

b. pancreas

c. spleen

d. stomach

2. The gastrointstinal tract has 4 basic layers. Which layer isthe one that comes in contact with the food that you eat?

Select one:

a. serosa

b. submucosa

c. muscularis

d. mucosa

3. Which digestive organ contains 3 layers of muscle tissue inthe muscularis?

Select one:

a. esophagus

b. large intestine

c. stomach

d. anus

The esophagus is the first organ in the digestive tract thatsecretes digestive enzymes to begin the chemical (molecular)breakdown of food.

Select one:

True

False

Gastric ulcers are often caused by bacterial infection.

Select one:

True

False

Lactose intolerance causes gas, bloating and stomach achesbecause undigested sugar molecules, called lactose, end up gettingdigested by bacteria in the intestines. When they digest it, theyproduce lots of gases.

Select one:

True

False

7. The lower esophageal sphincter prevents food in the stomachfrom backing up into the esophagus.

Since the esophagus is not equipped to handle the harsh acids inthe stomach, when food (mixed with stomach acids) does back up intothe esophagus, you get symptoms such as heart burn. This is calledgastroesophageal reflux (or "reflux").

When reflux is left untreated for many years, the person becomesa trisk for esophageal cancer. This is because the esophagus gets"burned" by the acids over and over again which can eventuallytrigger the development of cancerous cells.

Select one:

True

False

Peristalsis is defined as the rhythmic contractions of thedigestive system that pushes food along the digestive tract.

Select one:

True

False

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ANAT 100 Lecture Notes - Lecture 10: Left Colic Artery, Brush Border, Antrum

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