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Animations: The Muscular System
Skeletal Muscle
After
viewing the animation, answer these questions:
1.
is responsible for
voluntary movement of the human body.
2.
What
is the structure of these muscles?
3.
What
is the epimysium?
4.
At
the ends of the muscle, the epimysium is continuous with
5.
What
is the perimysium?
6.
What
is a fascicle?
7.
What
is the endomysium?
8.
A
muscle fiber consists of
9.
What
is unique about the nuclei of a muscle fiber? Where are they located?
10.
What
structures dominate the interior of the muscle fiber?
11.
What
are the two types of protein filaments that compose the myofibril?
12.
Name
the orderly contractile unit of the muscle fiber.
13.
The
shortened sarcomeres result in , and ultimately .
Neuromuscular Junction
After
viewing the animation, answer these questions:
What sequence of events occurs
when an action potential arrives at the presynaptic terminal?
What sequence of events occurs
when the calcium ions enter the presynaptic terminal?
What is the function of
acetylcholine?
The movement of ions into the muscle cell results in .
Once threshold has been reached
_____________.
What happens to the
acetylcholine after the generation of an action potential on the muscle
cell membrane?
Sliding Filament
After
viewing the animation, answer these questions:
Describe the muscle
myofilaments in a relaxed muscle.
What interaction do these
myofilaments have during contraction?
What is the result?
Describe the muscle myofilaments
in a fully contracted muscle.
Excitation-Contraction Coupling
After
viewing the animation, answer these questions:
Action potentials are
propagated over which structure of the skeletal muscle fiber?
How does the action potential
arrive into the interior of the muscle fiber?
What does the entry of the
action potential cause to occur inside the muscle fiber?
This causes ions to diffuse from the into the .
Where is the tropomyosin
located? What is it covering?
Describe the molecules attached
to the tropomyosin.
What events occur when the
calcium ions bind to the troponin molecule?
How are cross-bridges formed?
Cross Bridge Cycle
After
viewing the animation, answer these questions:
During contraction of a muscle,
bind to . This moves out of the way and uncovers for on the ____
.
What molecules are attached to
the myosin head from the previous cycle of movement?
How are cross-bridges formed?
What is released in the process?
How is the myosin head moved? What
does this cause? What is released from the myosin head when this occurs?
How is the bond between the
actin and myosin filaments broken? How is energy released? What happens to
this energy?
After the myosin head returns
to its upright position, what occurs if calcium ions are still present?
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