week8C1 : Red meat-muscle

Question 1

what is the main carbohydrate in meat

Answer 1

lactate (from the conversion of glycogen).

Question 2

what are the three classes of skeletal muscle protein

Answer 2

1. sarcoplasmic 2. myofibrillar 3. stomal

Question 3

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

Answer 3

myofibrillar

Question 4

___ proteins are insoluble

Answer 4

stromal

Question 5

____ proteins are soluble

Answer 5

sarcoplasmic

Question 6

What are the type of protein mostly present in skeletal muscle

Answer 6

myofibrillar

Question 7

why does young meat have a more pale color

Answer 7

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

Question 8

____ proteins are respoinsible for the mechanical work

Answer 8

myofibrillar

Question 9

___ proteins are found in the cytoplasms

Answer 9

sarcoplasmic

Question 10

What is the most abundant protein in the myofibrillar protein class

Answer 10

myosin

Question 11

what is the role of troponin C

Answer 11

binding calcium

Question 12

what is the role the troponin T

Answer 12

binding troponin complex and tropomyosin

Question 13

what is the role of troponin I

Answer 13

inhibits the binding of actin and myosin

Question 14

what is the role of tropomyosin

Answer 14

binds the actin and the troponin complex

Question 15

what is the role of the nebulin

Answer 15

regulates thin filament assembly

Question 16

what is the role of tintin

Answer 16

regulates elasticity

Question 17

___ proteins contribute to the meat toughness.

Answer 17

stromal

Question 18

what is the most prevalent stromal protein

Answer 18

collagen

Question 19

what are the most prevalent non-protein nitrogen sources

Answer 19

ATP and creatine

Question 20

each myofibers is surounded by the ___(connective tissue)

Answer 20

endomysium

Question 21

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

Answer 21

perimysium

Question 22

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

Answer 22

epimysium

Question 23

what is the reservoir of calcium of the muscle fibers

Answer 23

sarcoplasmic reticulum

Question 24

____ are made of multiple sarcomere

Answer 24

myofibrils

Question 25

the ____ is the membrane around the muscle fibers

Answer 25

sarcolemma

Question 26

the ____ contain multiple sacromere

Answer 26

myofibrils

Question 27

T or F : The myofibers contain multiple nuclei

Answer 27

multinicleated

Question 28

type____ are more equipped for the aerobic metabolisms because higher amount of oxidative organelles.

Answer 28

type I

Question 29

Type __ and __ are more equipped for anaerobic metabolism

Answer 29

type IIa and IIb

Question 30

the structural fundamental unit of the myofibril is the ____

Answer 30

sacromere

Question 31

I bands are ____ when examined with polarized light

Answer 31

isotropic

Question 32

A bands are ____ when examined with polarized light

Answer 32

anisotropic

Question 33

the ___ band consist only of thin filaments overlapping

Answer 33

I

Question 34

The ___ zone consist only of thick filaments overlapping

Answer 34

H

Question 35

Question 36

name de zones

Answer 36

Question 37

The ____ represent the junction between two sacromere

Answer 37

z-disk

Question 38

the ____ filament goes from the M line to the Z line

Answer 38

tintin

Question 39

where is achored the thin filament

Answer 39

at the z disk

Question 40

T or F : the lenght of the thin and thick filament changes depending on the state of the muscle (rest or contracted)

Answer 40

false, it is only the lenght of the sacromere that changes

Question 41

myofibrils are made up of a smaller unit called a ____ – which is made up of two GROUPINGS OF contractile proteins ____ and ____

Answer 41

myofilaments
MYOSIN and ACTIN

Question 42

Why wouldn’t you want to have short sacromere in meat

Answer 42

because it results in meat thoughness

Question 43

when there is no calcium, the ____ is in the way for the binding of myosin with actin

Answer 43

tropomyosin

Question 44

what is the most abundant sarcoplasmic protein

Answer 44

glyceraldehyde phosphate dehydrogenase

Question 45

what is the second and third most abundant sarcoplasmic protein

Answer 45

second : aldolase
third : Creatinine kinase