1.
2.
Which of the following represents a single skeletal muscle cell?
1. Fascicle
2.
Muscle fiber
3.
Myofibril
4.
Myofilament
What aspect of creatine phosphate allows it to supply energy to muscles?
a. ATPase activity
b. phosphate bonds
c. carbon bonds
d. hydrogen bonds
3) What are the opposite roles of voltage-gated sodium channels and voltage-gated
potassium channels?
The voltage-gated sodium channel helps in the movement of sodium ions across
the plasma membrane. The voltage-gated potassium channel will allow the influx of
potassium ions inside the cells. These two gated channels work opposite from each other.
The activation of one channel will inactivate the other channel. The activation and
inactivation is dependent on action potential which controls the depolarization and
depolarization channels. When voltage-gated channel opens, it will carry the potassium
ion down the electrochemical gradient rapidly and selectively. The rapid movement is
dependent on the diffusion rate of the potassium ion. The potassium ion then moves into
the cell. Action potential is created when there is delayed counter flow of potassium. This
will make the potassium ion inside the cell to exit in order to re-polarize the outside of
the cell. The exit of the potassium ion will cause depolarization within the cell. When
enough depolarization is reached inside of the cell, an action potential is created that
activates a voltage-gated sodium channel. AN influx of sodium ion inside the cell is then
established.
4.
Ask at least one specific question about the material. If there was something you didn’t
understand, ask for an explanation of that. If there was nothing that you didn’t
understand, ask for an elaboration on something you found interesting. This question
must be about a specific topic, and ask for specific explanations or information.
Are muscle fibers and fascicles different, or is fascicle just another name for a
muscle fiber? The book definitions were unclear as to if they were the same thing or not.