Download 1.-Creatine-Phosphate

(8) Energy systems in muscle cells
Energy
systems in
muscle cells
(A)
Creatine
Phosphate
(B) Lactic Acid
Metabolism
(C)
Types of skeletal
muscle fibres
(a) Energy systems in muscle cells
• State what creatine phosphate is and
the cells which use it
• State the role of creatine phosphate in
these cells
• State when creatine phosphate will run
out
• State how the levels of creatine
phosphate are restored
How are the muscles organised?
• We need to have a closer look at our
muscular system!
3 types of
muscle in
the body…
We will look
at skeletal
muscle in
the next
lesson!
Inside the muscle…
Sources of energy for muscle
cells
• Our muscle cells are constantly being
used and made to work therefore they
need a supply of energy.
• During strenuous muscle activity, the
cell rapidly breaks down its reserves of
ATP to release energy.
So… what do cells need creatine
phosphate for?
Click on the bottle!
Sources of energy for muscle
cells
• Muscle cells have an additional source
of energy in creatine phosphate that
can be used to replenish ATP pools
during rigorous bouts of exercise.
• Creatine phosphate breaks down to
release energy and phosphate that is
used to convert ADP to ATP at a fast
rate.
So… why doesn’t the cell use creatine
phosphate all the time?
The problem with creatine
phosphate
• This system can only support strenuous
muscle activity for around 10 seconds,
when the creatine phosphate supply
runs out.
• When muscle energy demand is low, ATP
from cellular respiration is used to
restore the levels creatine phosphate.
Task: copy diagram 7.24 on page 113
(a) Energy systems in muscle cells
• State what creatine phosphate is
and the cells which use it
• State the role of creatine
phosphate in these cells
• State when creatine phosphate will
run out
• State how the levels of creatine
phosphate are restored