Muscles 2

Question 1

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

Answer 1

1-2, 100

Question 2

Define summation.

Answer 2

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

Question 3

Is tetanic tension or twitch tension greater? Why?

Answer 3

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

Question 4

Define fused tetanus.

Answer 4

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

Question 5

Less overlap of filaments =

Answer 5

Less tension

Question 6

More overlap of filaments =

Answer 6

Filaments interfering with each other

Question 7

Muscle length for greatest isometric tension =

Answer 7

Optimal length

Question 8

What does movement around a limb require?

Answer 8

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

Question 9

What does the lever system amplify?

Answer 9

Muscle shortening velocity which produces increased manoeuvrability.

Question 10

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

Answer 10

Face and back
Smooth muscle
Cardiac muscle