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Group E: Digestive System Chapter. 48 pg. 984-992. BY: James Lentz, Nile Jones, Hector Ponce, Diego Gutierrez . Table of Contents. Mouth and Teeth: Hector Ponce, Diego Gutierrez Esophagus and Stomach: James Lentz Intestines: Nile Jones . Mouth and Teeth.

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group e digestive system chapter 48 pg 984 992

Group E: Digestive SystemChapter. 48 pg. 984-992

BY: James Lentz,

Nile Jones,

Hector Ponce,

Diego Gutierrez

table of contents
Table of Contents

Mouth and Teeth: Hector Ponce, Diego Gutierrez

Esophagus and Stomach: James Lentz

Intestines: Nile Jones

mouth and teeth

Mouth and Teeth

Hector Ponce, Diego Gutierrez

mouth
Mouth

Has saliva that breaks down food particles

Saliva helps lubricate food down the esophagus

Chamber for ingestion and initial processing

Saliva contains hydrolytic enzyme salivary amylase, which initiates the breakdown of the polysaccharide starch into disaccharide maltose

teeth
Teeth

Teeth is Used for the process of mastication (chewing)

Carnivorous teeth are pointed to tear off the meat lack flat grinding surfaces

Human teeth have both sharp and flat teeth to eat both plants and meat because we are omnivores

esophagus
Esophagus

Esophagus: A muscular tube that the swallowed food enters

Muscular contractions of the esophagus move food to the stomach

25 cm long

Consist of peristalsis that allow humans to swallow even if they are upside down

Peristalsis: Rhythmic waves of muscular contraction

The movement of food from the esophagus to the stomach is controlled by a ring of circular smooth muscle called sphincter

stomach
Stomach
  • A “holding station” involved in acidic breakdown of food
  • Stomach: saclike portion of the digestive tract
  • Stomach contains a third layer of smooth muscle for churning food and mixing it with gastric juice
  • Chief cells secrete pepsinogen, the inactive form of protease pepsin (protein-digesting enzyme)
  • Moves the food to the intestine by a pyloric sphincter
  • Gastric Juice: An acidic secretion of tubular gastric glands of the mucosa
    • Gastric Juice contains
    • Mucus secreting cells
    • Parietal cells
    • Chief cells
intestines

Intestines

Nile Jones

small intestines
Small Intestines

The capacity of the small intestine is limited, and its digestive process takes time

Approximately 4.5 m long in a living person, but 6 m when muscles relaxed

First 25 cm of the small intestine is the Duodenum

The remainder is divided into Jejunum and ileum

Digestion occurs in Duodenum and Jejunum

Epithelial wall of the small intestine is covered with fingerlike projections name villi

Microvilli are cytoplasmic extensions

Microvilli also participate in digestion because a number of digestive enzymes are embedded within the epithelial cell’s plasma membrane

large intestine
Large Intestine

Also called colon and is much shorter than the small intestine, occupying the last meter of the digestive tract

Its called large because of the larger diameter

Divided into two structures the cecum and appendix

No digestion takes place inside the large intestine

Large intestine prepares waste material to be expelled from the body

Most bacteria live inside the human colon and excess bacteria are incorporated into refuse material named feces

It then lives the body through the rectum

true and false
True and False

Muscular contractions of the esophagus move food to the small intestine

Saliva contains polysaccharide starch

Epithelial wall of the small intestine is covered with fingerlike projections name villi

Teeth is Used for the process of mastication (chewing)

Digestion takes place inside of the Large Intestine or the colon

multiple choice
Multiple Choice

(Fill in all that apply) Gastric Juice contains

Hydrolytic enzyme

Chief cells

Mucus secreting cells

Parietal cells

All of the above