week8C1 : Red meat-muscle Flashcards
what is the main carbohydrate in meat
lactate (from the conversion of glycogen).
what are the three classes of skeletal muscle protein
- sarcoplasmic 2. myofibrillar 3. stomal
what are the type of skeletal muscle protein that are soluble in salts
myofibrillar
___ proteins are insoluble
stromal
____ proteins are soluble
sarcoplasmic
What are the type of protein mostly present in skeletal muscle
myofibrillar
why does young meat have a more pale color
The veal has a pale color because of the lower abundance of myoglobin
____ proteins are respoinsible for the mechanical work
myofibrillar
___ proteins are found in the cytoplasms
sarcoplasmic
What is the most abundant protein in the myofibrillar protein class
myosin
what is the role of troponin C
binding calcium
what is the role the troponin T
binding troponin complex and tropomyosin
what is the role of troponin I
inhibits the binding of actin and myosin
what is the role of tropomyosin
binds the actin and the troponin complex
what is the role of the nebulin
regulates thin filament assembly
what is the role of tintin
regulates elasticity
___ proteins contribute to the meat toughness.
stromal
what is the most prevalent stromal protein
collagen
what are the most prevalent non-protein nitrogen sources
ATP and creatine
each myofibers is surounded by the ___(connective tissue)
endomysium
groups of myofibers fascile are surounded by the ___(connective tissue)
perimysium
the whole muscle is surounded by the ___(connective tissue)
epimysium
what is the reservoir of calcium of the muscle fibers
sarcoplasmic reticulum
____ are made of multiple sarcomere
myofibrils
the ____ is the membrane around the muscle fibers
sarcolemma
the ____ contain multiple sacromere
myofibrils
T or F : The myofibers contain multiple nuclei
multinicleated
type____ are more equipped for the aerobic metabolisms because higher amount of oxidative organelles.
type I
Type __ and __ are more equipped for anaerobic metabolism
type IIa and IIb
the structural fundamental unit of the myofibril is the ____
sacromere
I bands are ____ when examined with polarized light
isotropic
A bands are ____ when examined with polarized light
anisotropic
the ___ band consist only of thin filaments overlapping
I
The ___ zone consist only of thick filaments overlapping
H
name de zones
The ____ represent the junction between two sacromere
z-disk
the ____ filament goes from the M line to the Z line
tintin
where is achored the thin filament
at the z disk
T or F : the lenght of the thin and thick filament changes depending on the state of the muscle (rest or contracted)
false, it is only the lenght of the sacromere that changes
myofibrils are made up of a smaller unit called a ____ – which is made up of two GROUPINGS OF contractile proteins ____ and ____
myofilaments
MYOSIN and ACTIN
Why wouldn’t you want to have short sacromere in meat
because it results in meat thoughness
when there is no calcium, the ____ is in the way for the binding of myosin with actin
tropomyosin
what is the most abundant sarcoplasmic protein
glyceraldehyde phosphate dehydrogenase
what is the second and third most abundant sarcoplasmic protein
second : aldolase
third : Creatinine kinase
