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Flashcards in Muscles 2 Deck (10)
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1
Q

An action potential is ____ms long but a twitch can last up to ______ ms.

A

1-2, 100

2
Q

Define summation.

A

When many action potentials are fired during contraction and add up.

3
Q

Is tetanic tension or twitch tension greater? Why?

A

Tetanic as calcium concentration never gets low enough to allow troponin/tropomyosin cooperative bind re-block myosin sites.

4
Q

Define fused tetanus.

A

When all the contractile events join together and give a sustained contraction.

5
Q

Less overlap of filaments =

A

Less tension

6
Q

More overlap of filaments =

A

Filaments interfering with each other

7
Q

Muscle length for greatest isometric tension =

A

Optimal length

8
Q

What does movement around a limb require?

A

2 antagonistic groups of muscles, one for flexion and one for extension.

9
Q

What does the lever system amplify?

A

Muscle shortening velocity which produces increased manoeuvrability.

10
Q

What type of muscles are not arranged in a lever system?

A

Face and back
Smooth muscle
Cardiac muscle