Week 2 - Animal Nutrition Flashcards
What are essential nutrients?
Things animals need to ingest because the body can’t synthesize them.
How many essential amino acids are there?
9 out of the 20
How many essential fatty acids are there? Name them.
- Omega 3
- Omega 6
they make up the phospholipid bilayer
How do we get essential vitamins?
by eating PLANTS
Which vitamin is not synthesized by plants?
B12
What do essential minerals come from?
Weathering of rocks, absorbed by plants. We then eat plants
What will you crave if you have an iron deficiency ?
Ice cubes, metal, etc
Which animal phyla does not have a digestive system?
Porifera
How do sponges digest?
INTRACELLULARLY. Flagella beat water in through pores, food particles get engulfed by phagocytosis. OR move and get engulfed by amoebocytes.
In one-way digestive systems, what is the function of the gastrovascular cavity?
Ingestion, digestion, absorption and elimination.
HYDRA: Enzymes are released from the sides and break down food particles which are then engulfed by food vacuoles.
in FLATWORMS: gastrovascular cavity is also the circulatory system.
What is the diff between one-way and two-way digestion systems?
One way is one hole and not specialized, two way is two holes with specialized sections
Which two phylas have gizzards?
Annelids (earthworms) and chordata (birds)
What are gizzards?
Grind + pulverize food by mashing them with small stones (which are in the gizzard)
What’s so special about turkey gizzards?
They store hard nuts in there. Then the nuts break open after a while and they can digest the inside
Why don’t small birds store seeds in their gizzards?
It would be too heavy to fly well. They eat fruit to digest faster
What does the tongue do?
Forms bolus, helps to swallow. VERY MUSCULAR AND SENSITIVE
What do salivary glands do?
Secrete substances for chem. digestion in mouth
What is saliva made out of? What does it do?
Water, salts, glycoproteins. Contains amylase. Lubricate foods + protect lining
What does the epiglottis do?
Covers the trachea so that we dont choke
What type of muscle is responsible for peristalsis?
Smooth
How many layers is the stomach? Why?
Three layers of smooth muscle IN DIFFERENT DIRECTIONS (the grain kinda) to optimize churning
What acid is in the stomach?
Hydrochloric acid