Chapter 7 (meat) Flashcards
Meat
4 types of beef with the sex
- steers (M)
- bulls (M)
- cow, heifers (F)
- calves (F,M)
when is pork slaughtered (age)
7-12 months
3 divisions of proteins in meat
- myofibrillar proteins (myosin and actin)
- structural protein (connective tissue)
- sarcoplasmic protein (blood)
composition of muscle fiber + composition
sarcomere, each of them made of 2 units:
- actin (thin)
- myosin (thick)
composition of connective tissue (2)
proteins + mucopolysaccharids
functions of connective tissue (3)
- provide structure + adhesiveness
- glue between muscle fibers (hold them together)
- surrunding all living cells
what are the adipose tissue (4)
- subcutanous fat (under skin)
- visceral fat (in abdominal cavity to protect organs)
- intermuscular (between muscles groups)
- intramuscular fat (fat within muscle fibers)
colour of young and old animals
young: white
old: yellow
what is marrow
soft, fatty material in the middle of large bones
- yellow in long bones
- red in spongy center of other bones
what make the colour changes
- oxygen
2. heat (denature myoglobin)
why adding nitrite by food industry (4)
- stop bacterial growth
- maintain bright pink-red colour of meat
- to slow development of rancid flavors
- to impart a sharp, piquant flavour
conclusion on a study about health consequence of red meat
increase 17& risk of developing bowel cancer
why red meats cause cancer (2)
- heme (broke down in N-nitroso compunds, damage intestinal cell lining, DNA replication is initiated to heal, so increase risk of error = mutations (risk of cancer)
- high temperature cooking: produce chemical that increased cancer risks
temperature where connective tissue dissolve in gelatin (colour = brown)
66 degree, 150 F
on what 2 aspects the grade is made
- quality (colour, fat distribution, surface texture, grain)
- yield (amount of lean meat compare to fat, bones and other inedible parts)
natural tenderizing that affects tender (7)
age (at slaughtered), heredity, species, aging, rigor mortis, marbling (fat content), cut