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chapter 8 unit 2
Terms in this set (24)
Why does fast twitch fiber contain more force than slow twitch?
has more cross bridges per cross sectional area and head contains ATPase
How much more force does fast twitch fibers have compare to slow twitch?
10 to 20%
What does strength training do to your fibers?
Hypertrophy (increase muscle fiber size) and Hyperplasia (increase muscle fiber number)
what does endurance training do to your fibers?
increase oxidative capacity aka aerobic power
T/F you can switch from 1 to 2a/2x muscle fibers?
False. You can only switch from 2x to 2a or 2a to 1 fibers
what is muscle atrophy?
losing muscle mass and strength due to be inactive
what happens to your body during initial atrophy?
during 2 say disuse because your protein is synthesis
what happens to you body during further atrophy?
you body increase protein break down
I atrophy really permanent?
No. you can reverse it with resistance training something astronauts do during space.
At what phase and how much muscle mass have you lost at 20 to 50 years of age?
slow phase and 10% muscle mass
At what phase and how much muscle mass have you lost at 50 to 80 years of age?
fast phase and 40% muscle mass
How much muscle mass have you lost at 80 years of age?
50% of muscle mass
Twitch is caused by how many stimulus?
Force summation is caused by how many stimulus?
caused by repeated stimulation before muscle completely relaxes
Tetanus is caused by?
person contraction fused together is single sustain contraction
The size principle?
The smaller the fiber aka the soma the easier you can recruit for the movement.
What does axon terminal of a motor neuron release?
The release of ACH from the axon terminal causes?
an end-plate potential and depolarize muscle fiber
What is a motor end plate?
pocket formed around motor neuron by sarcolemma
Why does muscle shortening occur?
due to movement of actin filament over myosin filament
Power stroke is when
formation of cross bridges between actin and myosin filament
when contracting which band size changes
during insertion of actin
I band disappear during heavy exercise contraction
T/F A band changes
No. it never changes
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