how muscle fibers contract

Question 1

which filament slides toward the center of the sarcomere during muscle contractions

Answer 1

actin filaments

Question 2

what is the sequence of events for sliding filament therory

Answer 2

crossbridge formation-myosin heads attach to actin filaments at the active sites
myosin hinge regions bend,causing myosin heads to swing
swinging of the myosin heads pulls the actinfilments sliding them toward each other toward the center of the sarcomere

Question 3

inside the myofibrils of skeletal muscle cells are structures called

Answer 3

sarcomeres

Question 4

results in the sarcomere when fully contracted

Answer 4

sarcomere length shortens
h zone disappears
I band length shortens
a band length remains the same

Question 5

when sliding of the actin filaments occurs in

Answer 5

isotonic contraction

Question 6

the specific name for a contraction where sliding of filaments causes the sarcomeres to shorten is

Answer 6

concentric contraction

Question 7

when standing muscles on top of the thigh shorten to lift your foot off the ground

Answer 7

concentric contraction

Question 8

an isotonic contraction where the sarcomeres lengthen is called

Answer 8

eccentric contraction

Question 9

actin filaments are sliding away from the center of the sarcomere instead of toward it

Answer 9

eccentric contraction

Question 10

the sliding of filaments inside the sarcomere does not occur in all types of contractions what is the contraction called if there is no sliding of actin at all

Answer 10

isometric