Skeletal Muscle Contraction

Question 1

I band contains ____

Answer 1

actin

Question 2

A band contains ____

Answer 2

actin & myosin within the length of myosin

Question 3

H zone contains ____

Answer 3

myosin

Question 4

what parts of the sarcomere shorten during contraction?

Answer 4

H band & I band

Question 5

tetanic contraction of skeletal muscle results from a cumulative increase in intracellular concentration of ____

Answer 5

Calcium

Question 6

increase in muscle mass due to weightlifting is primarily due to…

Answer 6

hypertrophy of individual muscle fibers

Question 7

how does smooth contraction muscle differ from skeletal and cardiac muscle?

Answer 7

does not require AP

Question 8

F actin function

Answer 8

binding sites for myosin

Question 9

function of tropomyosin

Answer 9

covers myosin binding sites

Question 10

troponin I binds to ____

Answer 10

actin

Question 11

troponin T is located…

Answer 11

at the end of tropomyosin

Question 12

troponin C binds to ____

Answer 12

Calcium

Question 13

myosin tail consists of…

Answer 13

2 heavy chains

Question 14

myosin head consists of…

Answer 14

4 light chains & ATPase activity

Question 15

location of the triad of skeletal muscle

Answer 15

AI junction

Question 16

triad of skeletal muscle consists of…

Answer 16

T tubule & 2 terminal cisternae of SR

Question 17

T tubule is ____ and functions to…

Answer 17

sarcolemma
transmit action potential

Question 18

what is stored in the SR?

Answer 18

Ca with calsequestrin

Question 19

sliding filament theory

what happens during the relaxed state?

Answer 19

ATP is bound to myosin head

Question 20

sliding filament theory

what happens during cross bridge formation?

Answer 20

ATPase converts ATP-> ADP+Pi
a. allows “high energy” or ready position
b. if Ca is present myosin binds to actin