Leah.J
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#1
Report Thread starter 2 years ago
#1
3 marks and all I could think of is
"Muscles cannot push, they can only pull, so to push a bone , another muscle will be needed to contract in the in opposing direction relaxing the 1st muscle."

To be honest, i'm not even sure what I wrote makes sense
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macpatgh-Sheldon
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#2
Report 2 years ago
#2
You are right for one mark.

Another important point is that when you have two opposing forces acting in opposite directions, you have greater precision in the control of movement at the joint concerned e.g. you can keep your left forefinger at arms length, close your eyes, and yet accurately move your right forefinger back and forth between the left one and the tip of your nose (and vice versa) - this is actually a test used in the clinical examination of the nervous system of patients.

This principle is analogous to the negative feedback control systems used in the precise control of levels of hormones, electrolytes, etc. in the body e.g. the fact that insulin reduces blood glucose, and that glucagon (and adrenaline) increase it, AND THIS KEEPS BLOOD GLUCOSE LEVELS WITHIN A VERY NAROOW RANGE in normality.

Hope this helps!
M
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Tamimur
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#3
Report 2 years ago
#3
Negative Feedback?
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Leah.J
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#4
Report Thread starter 2 years ago
#4
(Original post by Tamimur)
Negative Feedback?
what
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