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msdecember msdecember
wrote...
14 years ago
I am so confused, could anyone help me with exercise 2 skeletal muscle physiology activity 8  and 9 in the physioEx 8.0
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wrote...
#1
Donated
14 years ago
I found Exercise 2 Activity 9 here: https://biology-forums.com/index.php?topic=1754.0

I am still searching for Activity 8. The answers posted in the above thread are for PhysioEx 8.0 Human Physiology so if yours are different you have PhysioEx 8.0 for Anatomy and Physiology.

Let us know if those are not the questions in your activity. I am sure Duddy will be able to assist you when he logs on.
wrote...
#2
Staff Member
14 years ago
Here is activity 8...

Activity 8: Investigating Isometric Contraction (pp. 24–25)

7. As the muscle length is increased from 50 mm to 100 mm, the passive force is initially
zero and then, at approximately 84 mm, begins to sharply rise.
As the muscle length is increased from 50 mm to 100 mm, the active force increases
steadily until a muscle length of 75 mm and then begins to fall with increasing muscle
length.
As the muscle length is increased from 50 mm to 100 mm, the total force initially rises,
then, at a muscle length of 76 mm, begins to fall, and finally, at a muscle length of
94 mm, rises again producing a dip in the curve.
Because the total force curve is the result of the numerical sum of the active and passive
force data points, we see a rise on the left side of the total force due to the rise in the
active force. Note that the passive force has no influence in the rise on the left side. The
total force curve begins to fall because the active force falls. However, the total force
does not fall as fast as the active force because the passive force is simultaneously rising.
Finally, the sharp increase at the right side of the total force curve is almost entirely
due to the passive force.
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