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36 Cards in this Set

  • Front
  • Back

Functions of digestive system

- Physical and chemical breakdowns of food.


- absorption of nutrients.


- expulsion of waste materials.

Food contains...

Carbohydrates, proteins, fats, water, minerals, vitamins, "other"

Protein made from..

Amino acids

Carbohydrates made from..

Simple sugars (e.g. glucose)

Fats made from...

Triglycerides made from chains of fatty acids and glycerol

Enzymes

Act as biological catalysts. Increase rate of chemical reactions

Ingestion

Taking food in by mouth

Digestion

The breakdown of complex nutrients so they can be absorbed into blood

Absorption

Movement of digested food from digestive system into the blood

Metabolism

Chemical reactions in the body required for life

Egestion

Removal of waste production of digestion via anus

Ruminant

Has 4 chambered ruminant stomach (cow). Oesophagus, reticulum, rumen, omasum, abomasum, small intestine, caecum, colon. Energy from volatile fatty acids.

Non ruminant herbivore

Enlarged caecum and colon for digestion of cellose (horse)

Prehension, mastication, deglutition, eructation

Grasping with lips. Chewing. Swallowing. Burping.

Purpose of cardiac sphincter

Controls movement of food between oesophagus and stomach

Describe the mucosa in the reticulum

Papillae form honeycomb pattern

Describe the mucosa in the omasum

Papillae covered folds project into the limen like "pages of a book"

Describe the mucosa in the ruman

Shag carpet

Role of pancreas

Produce enzymes to break down long macromolecule chains into shorter length. Under the liver.

Numerous bean shaped areas of lymphatic tissue?

Lymph nodes

Hepatocytes

Liver cells

Function of HCI

Hydrochloric acid - denatures (unfolds) proteins. Only secreted when food in stomach. Mucous secreted to protect stomach

Enzymes produced by pancreas for starch, protein, and fat

Starch - amylase


Protein - pepsin, trypsin, peptidases


Fat - lipase

Pyloric sphincter

Muscle that controls food leaving stomach

Mesentery

Clear membrane that holds intestines in place with blood vessels running though (rat)

Where is food regurgitated from in ruminant?

Rumen

Order food passes through ruminant stomach

Reticulum, rumen, omasum, abomasum

Bile

Is produced by liver and stored in gall bladder. Essential for fat breakdown

Which is longer, ileum or jejunum?

Jejunum

"True stomach"

Abomasum

Peristalsis

Muscles of digestive tract squeeze in waves to push food along

Gastrin

Hormone which stimulates acid production

Gastric glands produce..

Some enzymes for digestion, HCI, mucous, hormones

Anatomy of small intestine

Stomach (pyloric sphincter), duodenum, jejunum, ileum (ileocaccal valve), large intestine

Liver

Production of bile, process nutrients, storage of fat soluble vitamins, detoxification of drugs and breakdowns of hormones

Large intestine

Caecum, colon, rectum.