Dr. Karius Contraction 2 Flashcards

1
Q

during isotonic contraction, the thin and thick filaments

A

overlap one another

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2
Q

during isotonic contraction the muscle

A

gets shorter

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3
Q

during isotonic contraction

A

the torque of the muscle has to increase

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4
Q

isometric

A

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

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5
Q

isotonic

A

when muscle contracts and there IS movement

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

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6
Q

Cross bridge cycling….slowly

A

isometric

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7
Q

cross bridge changes: isotonic

A

does occur

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8
Q

ATP required for isometric and isotonic?

A

yes for both

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9
Q

shortening of muscles during isometric contraction

A

very very little

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10
Q

shortening of muscles during isotonic contraction

A

yes

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11
Q

How much “force” development does isometric contraction have?

A

maximal

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12
Q

how much “force development” does isotonic contraction have

A

none

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13
Q

does isometric have ANY shortening?

A

yes but very little.

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14
Q

why is there some shortening during isometric contraction?

A

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”

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15
Q

the first event that happens when you pick up weight it

A

actually a series elastic element

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16
Q

the first event that happens when you pick up weight it

A

actually a series elastic element

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17
Q

the first event that happens when you pick up weight it

A

actually a series elastic element

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18
Q

the first event that happens when you pick up weight it

A

actually a series elastic element

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19
Q

the first event that happens when you pick up weight it

A

actually a series elastic element

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20
Q

the first event that happens when you pick up weight it

A

actually a series elastic element

21
Q

the first event that happens when you pick up weight it

A

actually a series elastic element

22
Q

does isometric contraction happen during isotonic motion?

A

yes, all motion is a combination of isometric and isotonic

23
Q

what is the first stage of lifting something?

A

stretch series element (isometric) STRETCH

24
Q

what is the second stage of lifting something?

A

generates the force: isometric contraction GENERATE FORCE

25
what is the third stage of lifting something?
isotonic contraction "lifting" LIFT
26
things that change muscle contraction
the length of the muscle how much weights the muscle is trying to move (the "load") when the muscle is affected by the weight
27
Force is proportional to
the number of cross bridge heads (how many are cycling)
28
at normal resting, the muscle is at
ideal length for generating contraction
29
maximal cross bridge cycling occurs during
rest
30
when is there less than maximal cross bridge cycling?
during contraction, shortening or lengthening
31
a muscle that is too long will have
less cross bridge cycling and less tension
32
tension would be least when the muscle
is at it's maximal length
33
a muscle that is too short will effect the cross bridges how?
the myosin heads have no actin to bind
34
tension decrease when the muscle
is too short or too long
35
how much passive tension do you have during a shortening length of muscle
none
36
when does passive tension begin to occur?
during muscle lengthening
37
passive tension -
the tendon being stretched
38
passive tension and active tension
sum together ro peosuxw "TOTAL TENSION"
39
Active tension declines when
there are no more cross bridges occurs when muscle is too long or too short
40
active tension =
what cross bridges can do
41
passive tension is the "blank..."effect
rubber band effect
42
preload
the effect the load has on the muscle prior to contraction
43
afterload
the weight has been transferred to something else
44
why doesnt the load force on a diagram ever go to zero?
your muscles have to move themselves
45
if the muscle is stretched prior to contraction, what kind of load is it?
pre-load
46
if the muscle is not stretched prior to contraction, what kind of load is it?
after load
47
muscle too short
too much overlap = thick filaments are in the way of thin filaments = less tension
48
Afterload: effect at the start of contraction
more time spent in isometric contraction for force generation
49
Preload: effect at the start of contraction
decreased active tension due to stretch