ATP and Muscle Contraction

• ATP is produced from ADP and Pi in aerobic respiration

• ATP is used to provide energy for muscle contraction.

• When ATP is broken down to ADP and Pi energy is released that is used to power the concentration

Slow twitch muscle fibers

• Contraction is slow and less powerful contractions can be made for long periods

• fibers adapted for aerobic Respiration

• many mitochondria

• Store of glycogen. (store of glucose)

• Contains Large amounts of Myoglobin (protein that Stores Oxygen)

• large blood supply with many Capillaries.

Fast twitch muscles : TYPE 1

• 2 types

• fast twitch Oxidative fibers Similar Many Mitochondria

• A lot of myoglobin Many blood Capillaries

• Hydrolose ATP rapidly and Contract

• Relatively Resistant and fatigue.

Fast twitch muscles : TYPE 2

• Glycolytic fast twitch that fatigue quickly

• Fibers show following adaptations to their role

• Thicker myosin filaments

• fewer Capillaries

• Stove of glycogen for anaerobic respiration