Question

TS?
Fig. 8.17 Two muscles work together to move
a bone
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contracted? You can observe similar
contraction of muscles in your leg when
s
you walk or run.
r
When contracted, the muscle
?
becomes shorter, stiffer and thicker. It
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pulls the bone.
Muscles work in pairs. When one of
them contracts, the bone is pulled in
that direction. The other muscle of the
pair relaxes. To move the bone in the
opposite direction, the relaxed musle
contracts to pull the bone towards its
original position, while the first relaxes.
A muscle can only pull. It cannot push.
Thus, two muscles have to work together
to move a bone. (Fig. 8.17)
observe a swollen region is the upper
arm? This is a muscle. The muscle
bulged due to contraction (it became
smaller in length). Now bring your arm
back to its normal position. What
happened to the muscle? Is it stilln​

Answer 1

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