Exam 1: Last Year & Extra Material Flashcards
REQUIRED nutrients for all animals
Minerals
Lipids
Protein
Water
Vitamins
Enzymatic digestion occurs in the gastric stomach
Protein
Can be used to provide energy in the body
Carbohydrates
Lipids
Protein
ALWAYS organic compounds
Carbohydrates
Lipids
Protein
Vitamins
Enzymatic digestion occurs in the small intestine
Carbohydrates
Lipids
Protein
One example of an important structure-function relationship in the GI tract. Where does this occur in the GI tract and one example we discussed for a specific species.
Ruminants: have incisors on the bottom for biting off grass and large molars to chew forages which allow them to ruminate effectively
Has limited large intestinal fermentation
Chicken
Is an obligate carnivore
Cat
A good research model for human GI tract
Pig
Has a complex foregut
Cattle
Why do various structures in the GI tract work to decrease feed particle size?
As particle size decreases, surface area increases, and digestibility increases
CHO
Carbohydrates
AA
Amino Acids
VFA
Volatile Fatty Acids
Enterocyte
Absorptive cell in the small intestine
Non-essential FA
A fatty acid not needed in the diet because the animal can make it with the proper substrate
Proventriculus
Gastric stomach in birds
Midgut
Small Intestine
Cellulose digestibility
Horses < Cattle
Passage Rate
Hindgut fermenters > Ruminants
Digestion of nutrients
Small intestine > stomach
Capacity in pigs
Foregut = Midgut
Capacity in ruminants
Midgut < Foregut
Capacity in ponies
Large intestine > Small intestine
Pepsin
Protein digestion
Ventriculus
Mechanical digestion (grinding)
Motility
Move digesta to next section
Cephalic phase
Regulation of secretions - saliva
Mucus
Protection from HCl & enzymes
Villus
Increase surface area for absorption
Incisors
Front teeth that bite off food
4 main processes of nutrition
- Ingest feed
- Digest feed
- Absorb nutrients
- Use nutrients
3 ways the GI tract protects itself from chemical secreted to digest feed
- Salvia protects teeth
- Mucus in stomach and small intestine
- Secretion of HCl separately in stomach
What nutrient always contain nitrogen
Proteins
Which if the following is NOT true regarding the gastric stomach
HCl it’s important for food breakdown
Which of these does the GI tract NOT do
Have a lumen that in on the inside of the body
Which of these is NOT a way the GI tract protects itself from pathogens present in feed
Zymogens
Which of these is secured as a zymogen
Proteases
What is the function of small intestinal crypts
To house stem cells that multiply to provide enterocytes and other epithelial cells
Which of the following is NOT true about saliva
It is regulated almost entirely by hormones
How do the GI tracts of chickens compare with pigs
- Organic compounds are broken down by microbes
- Pigs rely more on their teeth to decrease particle size than chickens do
- Chickens have less Hindgut fermentation than pigs
- Chickens have a storage pouch along the esophagus, but pigs do not
Which if these is NOT true about fermentation
The goal of microbes is to provide goof products for the host
Why can horse eat a forage-based diet
They have a large, ensacculated/sacculated cecum and colon
Which of the following is NOT true about digestion and absorption
Major enzymatic digestion begins in the gastric stomach