structure of skeletal muscles

Question 1

which kind of muscles are branched

Answer 1

cardiac

Question 2

largest muscle

Answer 2

skeletal

Question 3

which muscle has the entire sarcomere apparatus absent

Answer 3

smooth muscle

Question 4

t tubules are absent in

Answer 4

smooth muscles

Question 5

which muscles never tetanize

Answer 5

cardiac muscles

Question 6

summation is seen only in

Answer 6

skeletal muscles

Question 7

resting membrane potential is unstable in

Answer 7

smooth muscles

Question 8

in smooth muscles calcium binds with

Answer 8

calmodulin

Question 9

which muscle has neurogenic and myogenic control

Answer 9

skeletal and cardiac respectively

Question 10

which muscle contracts fastest

Answer 10

skeletal

Question 11

souce of calcium in smooth muscles

Answer 11

extracellular

Question 12

multinucleate muscle fibres in

Answer 12

skeletal muscles

Question 13

which layer covers the epimyesium

Answer 13

fascia

Question 14

what is a muscle bundle or fasciculi

Answer 14

a group of musscle cells surrounded by perimyesium

Question 15

what is aponeurosis

Answer 15

tendon that is flat stretched out and tough

Question 16

are sarcolemma and endomysium separate

Answer 16

yes

Question 17

groups of myofibrils are known as

Answer 17

cohnheim’s areas

Question 18

which band is also known as Q disc

Answer 18

+dark band

Question 19

basic contractile unit of muscle

Answer 19

sarcomere

Question 20

length of sarcomere

Answer 20

2-3u

Question 21

length of sarcomere

Answer 21

2-3u

Question 22

m line is formed by

Answer 22

myosin binding proteins

Question 23

what is h line

Answer 23

light region in dark band where only myosin is present

Question 24

serial order of muscle arrangement from largest to smallest

Answer 24

fascia- epimysium- muscle- perimysium- fasciculus- endomysium- sarcolemma- muscle fibre- myofibril - myofilament( actin and myosin)

Question 25

sliding mechanism is also known as

Answer 25

ratchet mechanism

Question 26

lateral processes from myosin filament

Answer 26

cross bridges

Question 27

which class of myosin in present in sarcomere

Answer 27

Myosin II

Question 28

how many myosin molecules in one myosin filament

Answer 28

200

Question 29

how many chains in one myosin molecule

Answer 29

2 heavy chain and 4 light chain

Question 30

2 parts of each myosin molecule

Answer 30

head part and tail part

Question 31

what is myosin tail formed of

Answer 31

two heavy chains that are helically twisted around each other

Question 32

in which part is myosin head absent

Answer 32

h zone

Question 33

what are the two attachment sites in myosin head

Answer 33

one is for ATP and other is for actin filament

Question 34

f actin is a polymer of

Answer 34

G actin

Question 35

what attaches to active site of actin molecule

Answer 35

myosin head

Question 36

which protein masks the active site of actin

Answer 36

troponin

Question 37

three subunits of troponin

Answer 37

I,T,C

Question 38

which protein connects actin to Z line

Answer 38

actinin

Question 39

which protein runs in close association with actin and parallel to it

Answer 39

nebulin

Question 40

which protein connects sarcolemma and z line

Answer 40

desmin

Question 41

which protein connects m line and z line

Answer 41

titn

Question 42

which protein connects m line and z line

Answer 42

titin

Question 43

which protein is responsible for elasticity of muscles

Answer 43

titin

Question 44

which protein connects actin to dystroglycan

Answer 44

dystropin

Question 45

which protein connects actin to dystroglycan(transmembrane protein of sarcolemma)

Answer 45

dystrophin

Question 46

sarcoplasmic reticulum is what type of sarcoplasmic tubule

Answer 46

L tubule

Question 47

ECF runs through the lumen of which tubule

Answer 47

t tubule

Question 48

which tubules are close and open

Answer 48

L tubules are closed and T tubules are open(open to exxterior)

Question 49

what are terminal cisternae

Answer 49

a pair of dilated L tubules surrounding T tubule

Question 50

what is a triad in skeletal muscle

Answer 50

a t tubule surrounded by a pair of cisternae

Question 51

function of T tubule

Answer 51

transmission of action potential to interior of myocyte

Question 52

haemogobin analogue in muscles

Answer 52

myoglobin

Question 53

functions of L tubule

Answer 53

storage and release of calcium

Question 54

muscle composition

Answer 54

75% water, 25% solids (20% protein)