Presentation is loading. Please wait.

Presentation is loading. Please wait.

Digestion I. Introduction A. Processes. The basic digestive processes Ingestion, Digestion (mechanical and chemical), Absorption (extra-cellular and intracellular),

Similar presentations


Presentation on theme: "Digestion I. Introduction A. Processes. The basic digestive processes Ingestion, Digestion (mechanical and chemical), Absorption (extra-cellular and intracellular),"— Presentation transcript:

1 Digestion I. Introduction A. Processes

2 The basic digestive processes Ingestion, Digestion (mechanical and chemical), Absorption (extra-cellular and intracellular), and Elimination. Figure 41.7

3 B. Parts Overview

4 The basic parts tube (alimentary canal, G-I tract, etc.) and a series of glands (salivary, liver, pancreas, etc.) Figure 41.8

5 II. Development A. Simplest

6 1. Direct to gastrovascular cavity == Poriferans through Platyhelminthes Poriferans simply absorb molecules gathered from their watery homes. Choanocytes Figure 33.4

7 1. Direct to gastrovascular cavity == Poriferans through Platyhelminthes Figure 41.7Figure 33.10

8 B. Complex

9 1. Alimentary canal == Nemertea through the Chordates How is food moved through the tube? What forces are involved? Why have the segmentation of the tube? Figure 41.8

10 III. Mammalian A. Tube Sections 1. Sections

11 Figure 41.9

12 Functions 2. Functions

13 a. Oral cavity = ingestion, chewing, & chemical digestion teeth, tongue, buccal surfaces, and salivary glands b. Pharynx = move & lubricating food muscular wall and mucous glands c. Esophagus = move, lubricating food, & peristalsis muscular wall and sphincter d. Stomach = churn food & chemical digestion muscular wall and gastric glands

14 e. Small Intestine = chemical digestion &

15 e. Small Intestine = chemical digestion & absorption Figure 41.12

16 e. Small Intestine surface area Figure 41.13

17 f. Large Intestine = water absorption & packing surface area and muscular wall

18

19 g. Rectal and Anal Canals = packing & elimination muscular wall

20 B. Glands & Organs Salivary Glands 1. Salivary Glands

21 Salivary Glands = mucin, salivary amylase, buffers, & antimicrobial agents Saliva to coat food, start carbohydrate digestion, control acidity, and prevent infection

22 Gastric Glands 2. Gastric Glands

23 Gastric Glands = pepsinogen, HCl, & mucous. begin protein digestion, activate pepsinogen to pepsin, and buffer Figure 41.11

24 Liver & Gall Bladder 3. Liver & Gall Bladder

25 3. Liver and Gall bladder = secrete or store bile emulsifies fat Figure 41.19

26 Pancreas 4. Pancreas

27 Pancreas = secrete numerous digestive enzymes Figure 41.12

28 C. Absorption

29 1. What are the molecules and the mechanism of absorption for each of the ingested nutrient molecules?

30 D. Regulation Cephalic 1. Cephalic

31 Digestion regulation can be divided into the cephalic and the gastric phases? Cephalic phase == nervous response Events: Stimuli related to food starts?Salivary secretions Stimulation of the stomach smooth muscle

32 Gastric 2. Gastric

33 Gastric phase == nervous response and endocrine input Events: Stimuli is the stretching of the stomach wall? Release of stomach secretionsPancreatic enzymes Liver/GB bile releaseSmooth muscle stimulation

34 IV. Comparisons A. Dentition

35 Dentition is adapted to accommodate different diets. Types of teeth = incisors, canines, premolars, & molars Figure 41.16

36 B. Tubular Divisions

37 Tubular divisions are adapted to accommodate different diets. Figure Figure 41.18

38 Believe to Achieve.


Download ppt "Digestion I. Introduction A. Processes. The basic digestive processes Ingestion, Digestion (mechanical and chemical), Absorption (extra-cellular and intracellular),"

Similar presentations


Ads by Google