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Animal Digestive System(Note-Taking Guide)

http://www.glenroseffa.org

Topic # 3024

Ms. Blakeley


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Digestive SystemObjectives

Describe and understand the basic functions of

the primary components of the digestive system.

Compare the functions and locations of thedigestive organs in man, poultry, horses, cows

and swine.

Differentiate between and identify digestive

systems of man, horses, swine, poultry and

cows.


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Digestive System

Where large complex molecules are broken downinto simpler molecules

Digestive Tract:

Long tube beginning with mouth and ending with the anus _________________ (Ruminant)

A stomach with more than one compartment

(cows, sheep, deer)

_______________(Non-ruminant) A stomach with one compartment

(swine, horses)

___________(Poultry) No true stomach

(chickens, geese)


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Digestive Systems

_______ & ______ have a simple stomachwith an extensive intestinal system

__________ & _________ have a simplestomach with an extensive intestinal systemand an enlarged caecum

____________ have a complex stomach with

a simpler intestinal system ___________ have no teeth and no true

stomach with a crop and gizzard to grind food


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Mouth & Esophagus Mouth: prehensile tool (grasps & mixes food)

Chewing breaks down food

Salivary Glands secrete juices containing enzymes(digest food)

Mucin lubricates the feed for swallowing

Esophagus: muscular tube that connects mouthto stomach Peristaltic waves send feed down the esophagus,

(muscle contractions). Reverse Peristalsis = blowing chunks

The cardia, located at the end of the esophagusprevents feed in the stomach from coming back into

the esophagus. ( non-ruminants only)


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Ruminant Stomach

Occupies 3/4 of abdominal cavity, mostlyon the left side

_________(paunch): 80% of stomach,

lighter food collects here Microbes digest cellulose

Uses lots of water

_______________(hardware stomach):5% of stomach, heavy foreign items are

trapped here


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Ruminant Stomach (cont.)

__________ (many plies): 8% of

stomach, absorbs water

______________ (true stomach): 7% ofstomach, typical enzyme activity

Rumination= regurgitation, re-chewing

of food


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Rumination (regurgitation)

After rumen if full, it lies down to ruminate(chew its cud)

Cattle spend from 5-7 hours ruminating,broken up into 6-8 periods

Regurgitation is the process of forcing thefeed back into the mouth for chewing

Done through a series of muscularcontractions and pressure in the rumen andreticulum


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Avian stomach/gizzard

Since chickens have no _____, they swallow

food whole and its stored in the_______

Feed in proventriculus are secreted by theglandular stomach and mixed with feed

The feed moves to the _______and is ground

Epithelium breaks the feed into smaller

particles, further mixing proventricular

digestive juices with the feed in the gizzard

The end of the digestive system is the vent


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Small & Large Intestines

Small Intestine: long coiled tube

connecting __________ to large intestine

rest of the digestion and absorption takes

place here

surface covered with villi (surface area)

Large Intestine:_________, colon, rectum

absorbs water (makes feces more solid)

some vitamins & minerals absorbed here

Cecal Fermenters (Horse): similar to rumen


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