Dr. Karius Contraction 2

Question 1

during isotonic contraction, the thin and thick filaments

Answer 1

overlap one another

Question 2

during isotonic contraction the muscle

Answer 2

gets shorter

Question 3

during isotonic contraction

Answer 3

the torque of the muscle has to increase

Question 4

isometric

Answer 4

muscle contraction without movement

push against a wall as an example: the wall isn’t going anywhere but there is muscle contraction

muscle remains same length.
cross bridge cycles but no change in length. there is an increase in tension/force

Question 5

isotonic

Answer 5

when muscle contracts and there IS movement

same tone
cross bridge cycle shortens muscle length
there is no change in tension force

Question 6

Cross bridge cycling….slowly

Answer 6

isometric

Question 7

cross bridge changes: isotonic

Answer 7

does occur

Question 8

ATP required for isometric and isotonic?

Answer 8

yes for both

Question 9

shortening of muscles during isometric contraction

Answer 9

very very little

Question 10

shortening of muscles during isotonic contraction

Answer 10

yes

Question 11

How much “force” development does isometric contraction have?

Answer 11

maximal

Question 12

how much “force development” does isotonic contraction have

Answer 12

none

Question 13

does isometric have ANY shortening?

Answer 13

yes but very little.

Question 14

why is there some shortening during isometric contraction?

Answer 14

series elastic element: the tendons (elastic) and other tissues in series with the muscle that get shorter, because these tissues are elastic so they can get shorter

they are stretched by the contraction

essentially they are the slack that muscle contraction “takes up”

Question 15

the first event that happens when you pick up weight it

Answer 15

actually a series elastic element

Question 16

the first event that happens when you pick up weight it

Answer 16

actually a series elastic element

Question 17

the first event that happens when you pick up weight it

Answer 17

actually a series elastic element

Question 18

the first event that happens when you pick up weight it

Answer 18

actually a series elastic element

Question 19

the first event that happens when you pick up weight it

Answer 19

actually a series elastic element

Question 20

the first event that happens when you pick up weight it

Answer 20

actually a series elastic element

Question 21

the first event that happens when you pick up weight it

Answer 21

actually a series elastic element

Question 22

does isometric contraction happen during isotonic motion?

Answer 22

yes, all motion is a combination of isometric and isotonic

Question 23

what is the first stage of lifting something?

Answer 23

stretch series element (isometric) STRETCH

Question 24

what is the second stage of lifting something?

Answer 24

generates the force: isometric contraction GENERATE FORCE

Question 25

what is the third stage of lifting something?

Answer 25

isotonic contraction “lifting” LIFT

Question 26

things that change muscle contraction

Answer 26

the length of the muscle
how much weights the muscle is trying to move (the “load”)
when the muscle is affected by the weight

Question 27

Force is proportional to

Answer 27

the number of cross bridge heads (how many are cycling)

Question 28

at normal resting, the muscle is at

Answer 28

ideal length for generating contraction

Question 29

maximal cross bridge cycling occurs during

Answer 29

rest

Question 30

when is there less than maximal cross bridge cycling?

Answer 30

during contraction, shortening or lengthening

Question 31

a muscle that is too long will have

Answer 31

less cross bridge cycling and less tension

Question 32

tension would be least when the muscle

Answer 32

is at it’s maximal length

Question 33

a muscle that is too short will effect the cross bridges how?

Answer 33

the myosin heads have no actin to bind

Question 34

tension decrease when the muscle

Answer 34

is too short or too long

Question 35

how much passive tension do you have during a shortening length of muscle

Answer 35

none

Question 36

when does passive tension begin to occur?

Answer 36

during muscle lengthening

Question 37

passive tension -

Answer 37

the tendon being stretched

Question 38

passive tension and active tension

Answer 38

sum together ro peosuxw “TOTAL TENSION”

Question 39

Active tension declines when

Answer 39

there are no more cross bridges

occurs when muscle is too long or too short

Question 40

active tension =

Answer 40

what cross bridges can do

Question 41

passive tension is the “blank…“effect

Answer 41

rubber band effect

Question 42

preload

Answer 42

the effect the load has on the muscle prior to contraction

Question 43

afterload

Answer 43

the weight has been transferred to something else

Question 44

why doesnt the load force on a diagram ever go to zero?

Answer 44

your muscles have to move themselves

Question 45

if the muscle is stretched prior to contraction, what kind of load is it?

Answer 45

pre-load

Question 46

if the muscle is not stretched prior to contraction, what kind of load is it?

Answer 46

after load

Question 47

muscle too short

Answer 47

too much overlap = thick filaments are in the way of thin filaments = less tension

Question 48

Afterload: effect at the start of contraction

Answer 48

more time spent in isometric contraction for force generation

Question 49

Preload: effect at the start of contraction

Answer 49

decreased active tension due to stretch