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Lecture 18
Physio Exam 2
20
Physiology
Undergraduate 2
06/08/2010

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Term
Motor neuron and muscle fibers it innervates?
Definition
Motor Unit
Term
___________ AP activates all the fibers in a motor unit?
Definition
motor neuron
Term
_____ gathers small motor units then larger ones afterward.
Definition
Recruitment
Term
Recruitment allows what?
Definition
gradation of force
Term
During recruitment maximum force requires all _______ active simultaneously?
Definition
Motor Units
Term
What is a single muscle activation?
Definition
twitch
Term
1 neural action potential can lead to __________ which leads to 1 twitch?
Definition
1 muscle activation potential
Term
Summation of twitches is?
Definition
tetanus
Term
What do you need enough of so that all the myosin heads reach actin?
Definition
Calcium
Term
What is LO?
Definition
Length at which you generate the maximum force
Term
What is reduced overlap of thick and thin filaments?
Definition
falloff at long lengths
Term
Thick filaments hit how many lines in the falloff at short lengths?
Definition
2
Term
Thick filaments hit how many lines in the falloff at short lengths?
Definition
2
Term
In the fall off at short length what happens to the thin filaments?
Definition
they overlap and interfare with each other
Term
Heavy loads can be moved slow or quick in the force velocity relation?
Definition
slowly
Term
Light loads are moved slow or quick in the force velocity relation?
Definition
quick
Term
in the inverse relation high force load means what with velocity?
Definition
low velocity
Term
When dealing with low force load what happens with the velocity?
Definition
high velocity
Term
When muscles are stretched what willl be better maintenance?
Definition
better force maintenance
Term
When you activate stretch reflexes what else does this do?
Definition
the reflex contracts as well
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