understand the energy sources used by a muscle during
contraction, what the energy is used for, and how it can be
replenished. Also, know the advabtages and disadvatge of each
energy source.
The chemical process called _____ produces ___ ATP and supplies
energy for muscle contraction for _____.
a. Creatine phosphate, 4, 15 seconds
b. Kreb's cycle (aerobic respiration), 36, hours
c. Glycolysis, 2, 30-60 seconds
d. Creatine phosphate, 1, 15 seconds
e. All of the above except A
As the resistance (load) to muscle contraction increased, what
happened to the velocity of muscle contraction?
a) it increased
b) it stays the same
c) it increased dramatically and then leveled off
d) it decreased
2) how is wave summation achieved in vivo (that is, in the
living muscle)?
a) by decreasing the amount of potassium
b) by increasing the strength of a neuron’s action potential
c) by increasing the frequency of neuron firing
d) by myelinated great the neuron
Angular work is positive during eccentric muscle contraction and
negative during concentric
muscle contraction. With the aid of sketches, explain the reason
for work to be positive and
negative for eccentric and concentric muscle actions,
respectively.
1. How is the contraction of a skeletal muscle cell
different than the contraction of a smooth muscle cell? How does
this aid in each muscle cell's function? 2. What is the purpose of
myoglobin in slow-twitch muscle fibers? Why is there more myoglobin
in slow-twitch muscle fibers than in fast-twitch fibers? 3. What is
the purpose of gap junctions in cardiac muscle cells and some
smooth muscle cells?
1. How is the contraction of a skeletal muscle cell different
than the contraction of a smooth muscle cell? How does this aid in
each muscle cell's function? 2. What is the purpose of myoglobin in
slow-twitch muscle fibers? Why is there more myoglobin in
slow-twitch muscle fibers than in fast-twitch fibers? 3. What is
the purpose of gap junctions in cardiac muscle cells and some
smooth muscle cells?