week8C1 : Red meat-muscle Flashcards

1
Q

what is the main carbohydrate in meat

A

lactate (from the conversion of glycogen).

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2
Q

what are the three classes of skeletal muscle protein

A
  1. sarcoplasmic 2. myofibrillar 3. stomal
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3
Q

what are the type of skeletal muscle protein that are soluble in salts

A

myofibrillar

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4
Q

___ proteins are insoluble

A

stromal

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5
Q

____ proteins are soluble

A

sarcoplasmic

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6
Q

What are the type of protein mostly present in skeletal muscle

A

myofibrillar

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7
Q

why does young meat have a more pale color

A

The veal has a pale color because of the lower abundance of myoglobin

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8
Q

____ proteins are respoinsible for the mechanical work

A

myofibrillar

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9
Q

___ proteins are found in the cytoplasms

A

sarcoplasmic

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10
Q

What is the most abundant protein in the myofibrillar protein class

A

myosin

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11
Q

what is the role of troponin C

A

binding calcium

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12
Q

what is the role the troponin T

A

binding troponin complex and tropomyosin

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13
Q

what is the role of troponin I

A

inhibits the binding of actin and myosin

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14
Q

what is the role of tropomyosin

A

binds the actin and the troponin complex

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15
Q

what is the role of the nebulin

A

regulates thin filament assembly

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16
Q

what is the role of tintin

A

regulates elasticity

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17
Q

___ proteins contribute to the meat toughness.

A

stromal

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18
Q

what is the most prevalent stromal protein

A

collagen

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19
Q

what are the most prevalent non-protein nitrogen sources

A

ATP and creatine

20
Q

each myofibers is surounded by the ___(connective tissue)

A

endomysium

21
Q

groups of myofibers fascile are surounded by the ___(connective tissue)

A

perimysium

22
Q

the whole muscle is surounded by the ___(connective tissue)

23
Q

what is the reservoir of calcium of the muscle fibers

A

sarcoplasmic reticulum

24
Q

____ are made of multiple sarcomere

A

myofibrils

25
the ____ is the membrane around the muscle fibers
sarcolemma
26
the ____ contain multiple sacromere
myofibrils
27
T or F : The myofibers contain multiple nuclei
multinicleated
28
type\_\_\_\_ are more equipped for the aerobic metabolisms because higher amount of oxidative organelles.
type I
29
Type __ and __ are more equipped for anaerobic metabolism
type IIa and IIb
30
the structural fundamental unit of the myofibril is the \_\_\_\_
sacromere
31
I bands are ____ when examined with polarized light
isotropic
32
A bands are ____ when examined with polarized light
anisotropic
33
the ___ band consist only of thin filaments overlapping
I
34
The ___ zone consist only of thick filaments overlapping
H
35
36
name de zones
37
The ____ represent the junction between two sacromere
z-disk
38
the ____ filament goes from the M line to the Z line
tintin
39
where is achored the thin filament
at the z disk
40
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
41
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
42
Why wouldn't you want to have short sacromere in meat
because it results in meat thoughness
43
when there is no calcium, the ____ is in the way for the binding of myosin with actin
tropomyosin
44
what is the most abundant sarcoplasmic protein
glyceraldehyde phosphate dehydrogenase
45
what is the second and third most abundant sarcoplasmic protein
second : aldolase third : Creatinine kinase
46